D26817: Change docbooks in order to make Krusader build at least under Kubuntu/Ubuntu 18.04 LTS

[Yuri Chornoivan]

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

REPOSITORY
  R167 Krusader

REVISION DETAIL
  https://phabricator.kde.org/D26817

To: asensi, #krusader, yurchor
Cc: yurchor, kde-doc-english, #krusader, gennad, fbampaloukas, nmel, mjanczara, miroslavm, skadinna, janlepper, abika, martinkostolny, asensi, gengisdave, andreaska
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