[ci skip]make codes more readable (cocos2d#18627)

Author: minggo

cocos/renderer/CCRenderer.cpp

@@ -347,17 +347,17 @@ void Renderer::mapBuffers()
 
 void Renderer::addCommand(RenderCommand* command)
 {
-    int renderQueue =_commandGroupStack.top();
-    addCommand(command, renderQueue);
+    int renderQueueID =_commandGroupStack.top();
+    addCommand(command, renderQueueID);
 }
 
-void Renderer::addCommand(RenderCommand* command, int renderQueue)
+void Renderer::addCommand(RenderCommand* command, int renderQueueID)
 {
     CCASSERT(!_isRendering, "Cannot add command while rendering");
-    CCASSERT(renderQueue >=0, "Invalid render queue");
+    CCASSERT(renderQueueID >=0, "Invalid render queue");
     CCASSERT(command->getType() != RenderCommand::Type::UNKNOWN_COMMAND, "Invalid Command Type");
 
-    _renderGroups[renderQueue].push_back(command);
+    _renderGroups[renderQueueID].push_back(command);
 }
 
 void Renderer::pushGroup(int renderQueueID)

cocos/renderer/CCRenderer.h

@@ -160,7 +160,7 @@ class CC_DLL Renderer
     void addCommand(RenderCommand* command);
 
     /** Adds a `RenderComamnd` into the renderer specifying a particular render queue ID */
-    void addCommand(RenderCommand* command, int renderQueue);
+    void addCommand(RenderCommand* command, int renderQueueID);
 
     /** Pushes a group into the render queue */
     void pushGroup(int renderQueueID);