Docs: Standardize on "Returning a value from the filter" vs. "Passing a value to the filter".

The filter is the callback function added with `add_filter()`, therefore the hook passes a value to the filter, and the filter returns a value to change its behaviour.

The documentation is referring to the latter.

Props johnbillion.
See #49572, #16557.
Built from https://develop.svn.wordpress.org/trunk@48185


git-svn-id: http://core.svn.wordpress.org/trunk@47954 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/user.php

@@ -608,7 +608,7 @@ function get_blogs_of_user( $user_id, $all = false ) {
 	/**
 	 * Filters the list of a user's sites before it is populated.
 	 *
-	 * Passing a non-null value to the filter will effectively short circuit
+	 * Returning a non-null value from the filter will effectively short circuit
 	 * get_blogs_of_user(), returning that value instead.
 	 *
 	 * @since 4.6.0