Removed return statement

Author: raulfraile

components/expression_language/extending.rst

@@ -35,7 +35,7 @@ This method has 3 arguments:
 
     $language = new ExpressionLanguage();
     $language->register('lowercase', function ($str) {
-        return sprintf('$result = (is_string(%1$s)) ? strtolower(%1$s) : %1$s; return $result;', $str);
+        is_string(%1$s) ? strtolower(%1$s) : %1$s;
     }, function ($arguments, $str) {
         if (!is_string($str)) {
             return $str;