Need to update comment to say "Help"

```
        // Add command to Help menu, if it exists
```

The Help menu *should* be there, but I'd prefer to verify it:

```
        help_menu = Menus.getMenu(Menus.AppMenuBar.HELP_MENU);
        if (help_menu) {
            help_menu.addMenuItem(TOGGLE_SHORTCUTS_ID);
        } 
```