Doc: Fix typo

Change-Id: Id10c4e4773340f4d9650561d4335f98485687483
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>
OS X: Fix menu roles

Never use TextHeuristicRole because it doesn't work as expected with
translations.
Also remove some unneeded OS X scopes.

Task-number: QTCREATORBUG-13101
Change-Id: If53ac36d9bee1782343e65d01a875b7e5434ff39
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>