D13860: Fix typos in docbook

[Henrik Fehlauer]

This revision was automatically updated to reflect the committed changes.
Closed by commit R166:025030fb9bdd: Fix typos in docbook (authored by rkflx).

REPOSITORY
  R166 Spectacle

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D13860?vs=37085&id=37122

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

AFFECTED FILES
  doc/index.docbook

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