D23371: Markdown: multiple improvements and fixes

[Nibaldo González]

nibags added a reviewer: Framework: Syntax Highlighting.

REPOSITORY
  R216 Syntax Highlighting

REVISION DETAIL
  https://phabricator.kde.org/D23371

To: nibags, cullmann, dhaumann, #framework_syntax_highlighting
Cc: kwrite-devel, kde-frameworks-devel, LeGast00n, GB_2, domson, michaelh, ngraham, bruns, demsking, cullmann, sars, dhaumann
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