Docs: Improve doc blocks for hooks added in [53126].

Fix a variable name and provide examples of the hook names.

Follow up to [53126].

Props dlh, pbiron.
Fixes #53212.


git-svn-id: https://develop.svn.wordpress.org/trunk@53170 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/post.php

@@ -1714,6 +1714,11 @@ function register_post_type( $post_type, $args = array() ) {
 	 *
 	 * The dynamic portion of the filter name, `$post_type`, refers to the post type key.
 	 *
+	 * Possible hook names include:
+	 *
+	 *  - `registered_post_type_post`
+	 *  - `registered_post_type_page`
+	 *
 	 * @since 6.0.0
 	 *
 	 * @param string       $post_type        Post type.