Docs: Add a @global entry for $tinymce_version in _WP_Editors::default_settings().

Props tejas5989.
Fixes #41244.

git-svn-id: https://develop.svn.wordpress.org/trunk@41007 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-editor.php

@@ -928,6 +928,8 @@ final class _WP_Editors {
 	 * Returns the default TinyMCE settings.
 	 * Doesn't include plugins, buttons, editor selector.
 	 *
+	 * @global string $tinymce_version
+	 *
 	 * @return array
 	 */
 	private static function default_settings() {