Inline docs for hooks in MagPie.

props natejacobs.
see #25229.

Built from https://develop.svn.wordpress.org/trunk@25286


git-svn-id: http://core.svn.wordpress.org/trunk@25250 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rss.php

@@ -10,6 +10,7 @@
  *
  * @package External
  * @subpackage MagpieRSS
+ * @deprecated 3.0.0 Use SimplePie instead.
  */
 
 /**
@@ -17,8 +18,11 @@
  */
 _deprecated_file( basename( __FILE__ ), '3.0', WPINC . '/class-simplepie.php' );
 
-/*
- * Hook to use another RSS object instead of MagpieRSS
+/**
+ * Fires before MagpieRSS is loaded, to optionally replace it.
+ *
+ * @since 2.3.0
+ * @deprecated 3.0.0
  */
 do_action( 'load_feed_engine' );