Make the "\internal" qdoc command stand on its own line

Make the "\internal" qdoc command stand on its own line

The qdoc manual currently claims that the command must stand on its own line.

The change follows the consistency with the rest and how the example looks like
inside the qdoc manual for this command.

Change-Id: I6b653dc95cf9d84e4adf32220dace5d313678419
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>