docs: Fixed missing video on arm doc page (#987)

* Fix misspelled filename

* Fixed warnings about string escapes

Author: melund

Docs/body/shoulder_arm_model.md

@@ -25,7 +25,7 @@ Report](https://paperpile.com/shared/TUqWjt).
 
 ```{raw} html
 <video width="45%" style="display:block; margin: 0 auto;" controls autoplay loop>
-    <source src="../_static/ShouderArm_rotalting_model.mp4" type="video/mp4">
+    <source src="../_static/ShoulderArm_rotating_model.mp4" type="video/mp4">
 Your browser does not support the video tag.
 </video>
 <!--<img src="../_static/ShoulderCloseupBack.jpg" alt="Smiley face" width="45%">-->

Docs/conf.py

@@ -114,7 +114,7 @@ def tagged_commit():
 pygments_style = "AnyScript"
 
 ams_version = os.environ.get("AMS_VERSION", "8.0.4")
-if not re.match("^\d\.\d\.\d", ams_version):
+if not re.match(r"^\d\.\d\.\d", ams_version):
     raise ValueError("Wrong format for AMS version, environment variable")
 ams_version_short = ams_version.rpartition(".")[0]
 ams_version_x = ams_version_short + ".x"
@@ -131,7 +131,7 @@ def tagged_commit():
             raise Exception("Could not parse AMMR version")
 
 
-if not re.match("^\d\.\d\.\d", ammr_version):
+if not re.match(r"^\d\.\d\.\d", ammr_version):
     raise ValueError("Wrong format for AMMR version, environment variable")
 
 ammr_version_short = ammr_version.rpartition(".")[0]