Coding Standards: Allow $newlineEscape parameter in WP_Text_Diff_Renderer_inline::_splitOnWords().

This resolves a WPCS warning:
{{{
Variable "$newlineEscape" is not in valid snake_case format, try "$newline_escape"
}}}

The `WP_Text_Diff_Renderer_inline` class extends the `Text_Diff_Renderer_inline` class from the `Text_Diff` package and should have the same parameters as the parent class method, per the Task 1 section of ticket #51553.

Follow-up to [7747], [55163].

See #59650.

git-svn-id: https://develop.svn.wordpress.org/trunk@57633 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/class-wp-text-diff-renderer-inline.php

@@ -24,10 +24,10 @@ class WP_Text_Diff_Renderer_inline extends Text_Diff_Renderer_inline {
 	 * @param string $newlineEscape
 	 * @return string
 	 */
-	public function _splitOnWords( $string, $newlineEscape = "\n" ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.stringFound
+	public function _splitOnWords( $string, $newlineEscape = "\n" ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.stringFound,WordPress.NamingConventions.ValidVariableName.VariableNotSnakeCase
 		$string = str_replace( "\0", '', $string );
 		$words  = preg_split( '/([^\w])/u', $string, -1, PREG_SPLIT_DELIM_CAPTURE );
-		$words  = str_replace( "\n", $newlineEscape, $words );
+		$words  = str_replace( "\n", $newlineEscape, $words ); // phpcs:ignore WordPress.NamingConventions.ValidVariableName.VariableNotSnakeCase
 		return $words;
 	}
 }