Create a network/about.php page and leverage it, to prevent the dashboard from switching to the blog admin. fixes #19762.

git-svn-id: http://svn.automattic.com/wordpress/trunk@19699 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/network/credits.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * Network Credits administration panel.
+ *
+ * @package WordPress
+ * @subpackage Multisite
+ * @since 3.1.0
+ */
+
+/** Load WordPress Administration Bootstrap */
+require_once( './admin.php' );
+
+if ( ! is_multisite() )
+	wp_die( __( 'Multisite support is not enabled.' ) );
+
+require( '../credits.php' );