D18252: Fix minor Doxygen issues

[Ralf Habacker]

habacker added a comment.


  Thanks for your contribution.
  
  I submitted this patch to git branch Applications/18.12. The changes will be available with release 2.27.2 (KDE Applications 18.12.2)

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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