devel/qt5, Mk/bsd.qt.mk: Add qt5-doc to the list of ports devel/qt5 depends on

The patch moves the "doc" port in bsd.qt.mk from _USE_QT4_ONLY to
_USE_QT_ALL and bumps the PORTREVISION in devel/qt5 for the inclusion
of the qt5-doc port into the qt5 metaport.

Pre-Work for updating qtcreator to 4.0 for adding options to install
qt5-doc and qt5-examples to make qtcreator actually usable for
serious qt development.

PR: 209910
Submitted by: Ralf Nolden <nolden@kde.org> (kde)