Doc: update info on Qt Versions in Build & Run options

Update screenshot and add a new one.

Change-Id: I6e2845bbc31474e32c307982fd380a42722d5367
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
ClangToolChain: Allow clang-macx-32 mkspec

Task-number: QTCREATORBUG-10599
Change-Id: I091db84c81b0ad031744142568cc37d648e9dfb7
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>