Doc: Add Q_OS_ANDROID macro

Change-Id: If428f0b7c1540e809f756f426a6d222acea5d310
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Doc: Remove addressbook-fr

Documentation is generally not translated, this one sticks out.

Task-number: QTBUG-28535
Change-Id: Ib2cdbc8c94a6354af3369ff2dcf4df69cde4c381
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Geir Vattekar <geir.vattekar@digia.com>