Fix the return description for `switch_to_blog()` to reflect that it always returns true.

Props jeremyfelt.
Fixes #25328.

Built from https://develop.svn.wordpress.org/trunk@27347


git-svn-id: http://core.svn.wordpress.org/trunk@27199 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/ms-blogs.php

@@ -569,7 +569,7 @@ function update_blog_option( $id, $option, $value, $deprecated = null ) {
  *
  * @param int $new_blog The id of the blog you want to switch to. Default: current blog
  * @param bool $deprecated Deprecated argument
- * @return bool True on success, false if the validation failed
+ * @return bool Always returns True.
  */
 function switch_to_blog( $new_blog, $deprecated = null ) {
 	global $wpdb, $wp_roles;