copy edits to clarify functions (and links) for WordPress cache funct…

…ions

source/content/guides/wordpress-configurations/05-wordpress-cache-plugin.md

@@ -74,7 +74,7 @@ You can enable maintenance mode for others while working on your site.
 
 ## Use Pantheon Cache Functions Programmatically
 
-There are three functions that are useful to developers within the [pantheon-page-cache.php](https://github.com/pantheon-systems/WordPress/blob/default/wp-content/mu-plugins/pantheon-mu-plugin/inc/pantheon-page-cache.php) file that houses the Pantheon Cache plugin code. You can call them from within your own custom code using various WordPress hooks, such as [save_post()](https://developer.wordpress.org/reference/hooks/save_post/).
+There are functions that are useful to developers within the [Pantheon MU plugin](https://github.com/pantheon-systems/pantheon-mu-plugin/blob/main/inc/pantheon-page-cache.php). You can call them from within your own custom code using various WordPress hooks, such as [`save_post`](https://developer.wordpress.org/reference/hooks/save_post/).
 
 ### flush_site
 
@@ -118,6 +118,8 @@ This function flushes the cache for an individual term or terms which are passed
 public function clean_term_cache( $term_ids, $taxonomy )
 ```
 
+Additional filters are added and available only when the [Pantheon Advanced Page Cache](https://github.com/pantheon-systems/pantheon-advanced-page-cache/tree/e3b5552b0cb9268d9b696cb200af56cc044920d9?tab=readme-ov-file#adding-custom-keys) plugin is installed and active.
+
 ## Automatically Clear Cache on Archive Pages for Specific Custom Post Type
 
 By default, adding a post, page or custom post type, clears the cache for the homepage and associated terms or categories associated with it. To clear cache for a specific page when a specific custom post type is added:
@@ -131,16 +133,18 @@ add_action( 'save_post', 'custom_clearcache_archive_page' );
  * @return void
  */
 function custom_clearcache_archive_page( $post_id ){
-	if(get_post_type() === 'book') {
-		pantheon_clear_edge_paths(['/books-on-startups-entrepreneurship-and-venture-capital/']);
+	if ( get_post_type() === 'book' ) {
+		pantheon_clear_edge_paths( ['/books-on-startups-entrepreneurship-and-venture-capital/'] );
 	}
 
-	if(get_post_type() === 'public-media') {
-		pantheon_clear_edge_paths(['/archives/media/']);
+	if( get_post_type() === 'public-media' ) {
+		pantheon_clear_edge_paths( ['/archives/media/'] );
 	}
 }
 ```
 
+The `pantheon_clear_edge_paths` function is declared in the PHP runtime and is only available on the Pantheon platform.
+
 ## More Resources
 
 - [Testing Global CDN Caching](/guides/global-cdn/test-global-cdn-caching)