[Usability] kb shortcuts in tooltips and menus

[Geoffroy Menard <geoffm gmx com>]

I think it would be relevant to mention explicitly  in the HIG's that menu items should display the corresponding keyboard shortcut, and that the toolbar buttons should also display them in their tooltip.

Suggestion:

1. add this point to the guidelines of the page Toolbars / Labels and Tooltips
   • If the toolbar control has a corresponding keyboard shortcut, include it in the tooltip
2. add this point tothe guidelines of the page Menus
   
   • If the menu item has a corresponding keyboard shortcut, include it next to the item's name, aligned to the right