D18252: Fix minor Doxygen issues

[Ralf Habacker]

habacker accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R139 Umbrello

BRANCH
  doxygen (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D18252

To: yurchor, #umbrello, habacker
Cc: umbrello-devel, astranieri
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