More-specific docs for `wp_embed_handler_youtube()`.

Fixes #30711.

Built from https://develop.svn.wordpress.org/trunk@31018


git-svn-id: http://core.svn.wordpress.org/trunk@30999 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media.php

@@ -2293,9 +2293,9 @@ function wp_embed_handler_googlevideo( $matches, $attr, $url, $rawattr ) {
 }
 
 /**
- * YouTube embed handler callback.
+ * YouTube iframe embed handler callback.
  *
- * Catches URLs that can be parsed but aren't supported by oEmbed.
+ * Catches YouTube iframe embed URLs that are not parsable by oEmbed but can be translated into a URL that is.
  *
  * @since 4.0.0
  *

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31017';
+$wp_version = '4.2-alpha-31018';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.