D10542: Add docbook content which was lost during a merge and more cleanup

[Henrik Fehlauer]

rkflx added a reviewer: Documentation.
rkflx added a comment.


  (…actually add the correct reviewer…)

REPOSITORY
  R166 Spectacle

REVISION DETAIL
  https://phabricator.kde.org/D10542

To: rkflx, #spectacle, gregormi, #documentation
Cc: lueck, ngraham, rkflx
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