Enabling "make docs"
Enabling "make docs"

It was disabled for the Beta 2 docs, but for the final documentation,
it is needed.

Change-Id: I6a4ebac397fdfb7e21ea64f73731d02893053ba5
Reviewed-by: Geir Vattekar <566b604d287edf88fa7389d1cb9015d99d71f27e@digia.com>

kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc