Fix TODO comments in class reference

doc/classes/ArrayMesh.xml

@@ -72,7 +72,7 @@
 				The [param arrays] argument is an array of arrays. Each of the [constant Mesh.ARRAY_MAX] elements contains an array with some of the mesh data for this surface as described by the corresponding member of [enum Mesh.ArrayType] or [code]null[/code] if it is not used by the surface. For example, [code]arrays[0][/code] is the array of vertices. That first vertex sub-array is always required; the others are optional. Adding an index array puts this surface into "index mode" where the vertex and other arrays become the sources of data and the index array defines the vertex order. All sub-arrays must have the same length as the vertex array (or be an exact multiple of the vertex array's length, when multiple elements of a sub-array correspond to a single vertex) or be empty, except for [constant Mesh.ARRAY_INDEX] if it is used.
 				The [param blend_shapes] argument is an array of vertex data for each blend shape. Each element is an array of the same structure as [param arrays], but [constant Mesh.ARRAY_VERTEX], [constant Mesh.ARRAY_NORMAL], and [constant Mesh.ARRAY_TANGENT] are set if and only if they are set in [param arrays] and all other entries are [code]null[/code].
 				The [param lods] argument is a dictionary with [float] keys and [PackedInt32Array] values. Each entry in the dictionary represents an LOD level of the surface, where the value is the [constant Mesh.ARRAY_INDEX] array to use for the LOD level and the key is roughly proportional to the distance at which the LOD stats being used. I.e., increasing the key of an LOD also increases the distance that the objects has to be from the camera before the LOD is used.
-				The [param flags] argument is the bitwise or of, as required: One value of [enum Mesh.ArrayCustomFormat] left shifted by [code]ARRAY_FORMAT_CUSTOMn_SHIFT[/code] for each custom channel in use, [constant Mesh.ARRAY_FLAG_USE_DYNAMIC_UPDATE], [constant Mesh.ARRAY_FLAG_USE_8_BONE_WEIGHTS], or [constant Mesh.ARRAY_FLAG_USES_EMPTY_VERTEX_ARRAY].
+				The [param flags] argument is the bitwise OR of, as required: One value of [enum Mesh.ArrayCustomFormat] left shifted by [code]ARRAY_FORMAT_CUSTOMn_SHIFT[/code] for each custom channel in use, [constant Mesh.ARRAY_FLAG_USE_DYNAMIC_UPDATE], [constant Mesh.ARRAY_FLAG_USE_8_BONE_WEIGHTS], or [constant Mesh.ARRAY_FLAG_USES_EMPTY_VERTEX_ARRAY].
 				[b]Note:[/b] When using indices, it is recommended to only use points, lines, or triangles.
 			</description>
 		</method>

doc/classes/ImporterMesh.xml

@@ -32,7 +32,7 @@
 				The [param arrays] argument is an array of arrays. Each of the [constant Mesh.ARRAY_MAX] elements contains an array with some of the mesh data for this surface as described by the corresponding member of [enum Mesh.ArrayType] or [code]null[/code] if it is not used by the surface. For example, [code]arrays[0][/code] is the array of vertices. That first vertex sub-array is always required; the others are optional. Adding an index array puts this surface into "index mode" where the vertex and other arrays become the sources of data and the index array defines the vertex order. All sub-arrays must have the same length as the vertex array (or be an exact multiple of the vertex array's length, when multiple elements of a sub-array correspond to a single vertex) or be empty, except for [constant Mesh.ARRAY_INDEX] if it is used.
 				The [param blend_shapes] argument is an array of vertex data for each blend shape. Each element is an array of the same structure as [param arrays], but [constant Mesh.ARRAY_VERTEX], [constant Mesh.ARRAY_NORMAL], and [constant Mesh.ARRAY_TANGENT] are set if and only if they are set in [param arrays] and all other entries are [code]null[/code].
 				The [param lods] argument is a dictionary with [float] keys and [PackedInt32Array] values. Each entry in the dictionary represents an LOD level of the surface, where the value is the [constant Mesh.ARRAY_INDEX] array to use for the LOD level and the key is roughly proportional to the distance at which the LOD stats being used. I.e., increasing the key of an LOD also increases the distance that the objects has to be from the camera before the LOD is used.
-				The [param flags] argument is the bitwise or of, as required: One value of [enum Mesh.ArrayCustomFormat] left shifted by [code]ARRAY_FORMAT_CUSTOMn_SHIFT[/code] for each custom channel in use, [constant Mesh.ARRAY_FLAG_USE_DYNAMIC_UPDATE], [constant Mesh.ARRAY_FLAG_USE_8_BONE_WEIGHTS], or [constant Mesh.ARRAY_FLAG_USES_EMPTY_VERTEX_ARRAY].
+				The [param flags] argument is the bitwise OR of, as required: One value of [enum Mesh.ArrayCustomFormat] left shifted by [code]ARRAY_FORMAT_CUSTOMn_SHIFT[/code] for each custom channel in use, [constant Mesh.ARRAY_FLAG_USE_DYNAMIC_UPDATE], [constant Mesh.ARRAY_FLAG_USE_8_BONE_WEIGHTS], or [constant Mesh.ARRAY_FLAG_USES_EMPTY_VERTEX_ARRAY].
 				[b]Note:[/b] When using indices, it is recommended to only use points, lines, or triangles.
 			</description>
 		</method>

doc/classes/RenderingServer.xml

@@ -3738,12 +3738,11 @@
 			<description>
 				Copies the viewport to a region of the screen specified by [param rect]. If [method viewport_set_render_direct_to_screen] is [code]true[/code], then the viewport does not use a framebuffer and the contents of the viewport are rendered directly to screen. However, note that the root viewport is drawn last, therefore it will draw over the screen. Accordingly, you must set the root viewport to an area that does not cover the area that you have attached this viewport to.
 				For example, you can set the root viewport to not render at all with the following code:
-				FIXME: The method seems to be non-existent.
 				[codeblocks]
 				[gdscript]
 				func _ready():
-				    get_viewport().set_attach_to_screen_rect(Rect2())
-				    $Viewport.set_attach_to_screen_rect(Rect2(0, 0, 600, 600))
+				    RenderingServer.viewport_attach_to_screen(get_viewport().get_viewport_rid(), Rect2())
+				    RenderingServer.viewport_attach_to_screen($Viewport.get_viewport_rid(), Rect2(0, 0, 600, 600))
 				[/gdscript]
 				[/codeblocks]
 				Using this can result in significant optimization, especially on lower-end devices. However, it comes at the cost of having to manage your viewports manually. For further optimization, see [method viewport_set_render_direct_to_screen].
@@ -4531,27 +4530,37 @@
 			Flag used to mark an index array.
 		</constant>
 		<constant name="ARRAY_FORMAT_BLEND_SHAPE_MASK" value="7" enum="ArrayFormat" is_bitfield="true">
+			Mask of mesh channels permitted in blend shapes.
 		</constant>
 		<constant name="ARRAY_FORMAT_CUSTOM_BASE" value="13" enum="ArrayFormat" is_bitfield="true">
+			Shift of first custom channel.
 		</constant>
 		<constant name="ARRAY_FORMAT_CUSTOM_BITS" value="3" enum="ArrayFormat" is_bitfield="true">
+			Number of format bits per custom channel. See [enum ArrayCustomFormat].
 		</constant>
 		<constant name="ARRAY_FORMAT_CUSTOM0_SHIFT" value="13" enum="ArrayFormat" is_bitfield="true">
+			Amount to shift [enum ArrayCustomFormat] for custom channel index 0.
 		</constant>
 		<constant name="ARRAY_FORMAT_CUSTOM1_SHIFT" value="16" enum="ArrayFormat" is_bitfield="true">
+			Amount to shift [enum ArrayCustomFormat] for custom channel index 1.
 		</constant>
 		<constant name="ARRAY_FORMAT_CUSTOM2_SHIFT" value="19" enum="ArrayFormat" is_bitfield="true">
+			Amount to shift [enum ArrayCustomFormat] for custom channel index 2.
 		</constant>
 		<constant name="ARRAY_FORMAT_CUSTOM3_SHIFT" value="22" enum="ArrayFormat" is_bitfield="true">
+			Amount to shift [enum ArrayCustomFormat] for custom channel index 3.
 		</constant>
 		<constant name="ARRAY_FORMAT_CUSTOM_MASK" value="7" enum="ArrayFormat" is_bitfield="true">
+			Mask of custom format bits per custom channel. Must be shifted by one of the SHIFT constants. See [enum ArrayCustomFormat].
 		</constant>
 		<constant name="ARRAY_COMPRESS_FLAGS_BASE" value="25" enum="ArrayFormat" is_bitfield="true">
+			Shift of first compress flag. Compress flags should be passed to [method ArrayMesh.add_surface_from_arrays] and [method SurfaceTool.commit].
 		</constant>
 		<constant name="ARRAY_FLAG_USE_2D_VERTICES" value="33554432" enum="ArrayFormat" is_bitfield="true">
 			Flag used to mark that the array contains 2D vertices.
 		</constant>
 		<constant name="ARRAY_FLAG_USE_DYNAMIC_UPDATE" value="67108864" enum="ArrayFormat" is_bitfield="true">
+			Flag indices that the mesh data will use [code]GL_DYNAMIC_DRAW[/code] on GLES. Unused on Vulkan.
 		</constant>
 		<constant name="ARRAY_FLAG_USE_8_BONE_WEIGHTS" value="134217728" enum="ArrayFormat" is_bitfield="true">
 			Flag used to mark that the array uses 8 bone weights instead of 4.

doc/classes/SurfaceTool.xml

@@ -87,7 +87,7 @@
 			<param index="1" name="flags" type="int" default="0" />
 			<description>
 				Returns a constructed [ArrayMesh] from current information passed in. If an existing [ArrayMesh] is passed in as an argument, will add an extra surface to the existing [ArrayMesh].
-				[b]FIXME:[/b] Document possible values for [param flags], it changed in 4.0. Likely some combinations of [enum Mesh.ArrayFormat].
+				The [param flags] argument can be the bitwise OR of [constant Mesh.ARRAY_FLAG_USE_DYNAMIC_UPDATE], [constant Mesh.ARRAY_FLAG_USE_8_BONE_WEIGHTS], or [constant Mesh.ARRAY_FLAG_USES_EMPTY_VERTEX_ARRAY].
 			</description>
 		</method>
 		<method name="commit_to_arrays">