Doc: Updated the tagged examples list for Android

Removed the Boxes example from the list as it requires
OpenGL.

Task-number: QTBUG-32953
Change-Id: Ieb186afde0a87b12d7ab48037b31ae5895740d60
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>