[TASK][DOC] Add semantic markup

Definitions found on http://sphinx-doc.org/markup/inline.html#cross-referencing-documents

Change-Id: Ic25a0311638f16e40f6479444637906167c33e1d
Reviewed-on: https://review.typo3.org/24631
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers