D13860: Fix typos in docbook

[Yuri Chornoivan]

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

REPOSITORY
  R166 Spectacle

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D13860

To: rkflx, #spectacle, yurchor
Cc: kde-doc-english, skadinna