remove unnecessary comments (#16572)

cocos/base/CCDirector.h

@@ -213,9 +213,6 @@ public:
     /** Sets the glViewport.*/
     void setViewport();
     
-    /** How many frames were called since the director started */
-    
-    
     /** Whether or not the replaced scene will receive the cleanup message.
      * If the new scene is pushed, then the old scene won't receive the "cleanup" message.
      * If the new scene replaces the old one, the it will receive the "cleanup" message.

cocos/platform/mac/CCApplication-mac.h

@@ -54,10 +54,6 @@ public:
     */
     virtual void setAnimationInterval(float interval) override;
     
-    /**
-    @brief  Get status bar rectangle in GLView window.
-    */
-    
     /**
     @brief  Run the message loop.
     * @js NA