added missing @since annotations

framework/data/ActiveDataProvider.php

@@ -196,13 +196,13 @@ class ActiveDataProvider extends BaseDataProvider
             }
         }
     }
-    
-    public function __clone() 
+
+    public function __clone()
     {
         if (is_object($this->query)) {
             $this->query = clone $this->query;
         }
-        
+
         parent::__clone();
     }
 }