Fix for Step 2 of the Add a Command section

(int)TestCommandPackageGuids.cmdidTestSubCmd in the second steps first line of code should just be cmdidTestSubCmd otherwise it can't compile. It now matches the changed code in Step 3.

Author: Xero-9

docs/extensibility/adding-a-submenu-to-a-menu.md

@@ -93,7 +93,7 @@ This walkthrough builds on the demonstration in [Adding a Menu to the Visual Stu
 2.  Add the sub-command. Find the command constructor. Add the following lines just after the call to the `AddCommand` method.  
 
     ```csharp  
-    CommandID subCommandID = new CommandID(CommandSet, (int)TestCommandPackageGuids.cmdidTestSubCmd);  
+    CommandID subCommandID = new CommandID(CommandSet, cmdidTestSubCmd);  
     MenuCommand subItem = new MenuCommand(  
         new EventHandler(SubItemCallback), subCommandID);  
     commandService.AddCommand(subItem);  
@@ -157,4 +157,4 @@ This walkthrough builds on the demonstration in [Adding a Menu to the Visual Stu
 
 ## See Also  
  [Adding a Menu to the Visual Studio Menu Bar](../extensibility/adding-a-menu-to-the-visual-studio-menu-bar.md)   
- [Commands, Menus, and Toolbars](../extensibility/internals/commands-menus-and-toolbars.md)
+ [Commands, Menus, and Toolbars](../extensibility/internals/commands-menus-and-toolbars.md)