D8677: Update okular docbook

[Yuri Chornoivan]

yurchor accepted this revision as: yurchor.
This revision is now accepted and ready to land.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D8677

To: lueck, #documentation, #okular, yurchor
Cc: aacid
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