Docs: Replace $this in hook param docs with more appropriate names.

`$this` is a pseudo-variable that cannot be used as the name of a function parameter, so renaming these helps prevent errors when implementing hook callback functions.

Fixes #53457


git-svn-id: https://develop.svn.wordpress.org/trunk@51518 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -162,7 +162,7 @@ class WP_Scripts extends WP_Dependencies {
 		 *
 		 * @since 2.6.0
 		 *
-		 * @param WP_Scripts $this WP_Scripts instance (passed by reference).
+		 * @param WP_Scripts $wp_scripts WP_Scripts instance (passed by reference).
 		 */
 		do_action_ref_array( 'wp_default_scripts', array( &$this ) );
 	}