be consistent about if it's Mu or MU

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

@@ -47,7 +47,7 @@ You can increase the default time to live value to improve the chances that a vi
 
 ### Override the default max age
 
-Since the [1.4.0 update in the Pantheon Mu Plugin](/release-notes/2024/04/pantheon-mu-plugin-1-4-0-update), you can override the default `max-age` using a filter. This is useful if you want to set a different max age for specific pages or post types, or if you want to set it to a specific value programmatically.
+Since the [1.4.0 update in the Pantheon MU Plugin](/release-notes/2024/04/pantheon-mu-plugin-1-4-0-update), you can override the default `max-age` using a filter. This is useful if you want to set a different max age for specific pages or post types, or if you want to set it to a specific value programmatically.
 
 ```php
 add_filter( 'pantheon_cache_default_max_age', function() {