D9376: Prolog, RelaxNG, RMarkDown: Fix highlighting issues

[Volker Krause]

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

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  FixRemaining (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D9376

To: dhaumann, vkrause
Cc: #frameworks
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