Fix a copy/paste error in a comment.

see #31951.
Built from https://develop.svn.wordpress.org/trunk@32115


git-svn-id: http://core.svn.wordpress.org/trunk@32094 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/compat.php

@@ -40,7 +40,7 @@ endif;
 
 function _mb_strlen( $str, $encoding = null ) {
 	// The solution below works only for UTF-8,
-	// so in case of a different charset just use built-in substr()
+	// so in case of a different charset just use built-in strlen()
 	$charset = get_option( 'blog_charset' );
 	if ( ! in_array( $charset, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
 		return strlen( $str );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-beta4-32114';
+$wp_version = '4.2-beta4-32115';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.