Script Loader: Clarify documentation of `wp_resource_hints` hook.

Specify that the `wp_resource_hints` hook is firing for a single relation type.

Props: dimadin for initial patch.
See #37458.

Built from https://develop.svn.wordpress.org/trunk@38161


git-svn-id: http://core.svn.wordpress.org/trunk@38102 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/general-template.php

@@ -2816,7 +2816,7 @@ function wp_resource_hints() {
 
 	foreach ( $hints as $relation_type => $urls ) {
 		/**
-		 * Filters domains and URLs for resource hints.
+		 * Filters domains and URLs for resource hints of relation type.
 		 *
 		 * @since 4.6.0
 		 *

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta4-38160';
+$wp_version = '4.6-beta4-38161';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.