Fix Doxygen warnings
In latests release few Doxygen warnings slipped - CI was broken as the time regarding them due to a Gitlab bug that has now been resolved after Gitlab server upgrade.
Locally on macOS I didn't get them at the time; I saw them now but I gather it is due to the fact Doxygen was upgraded recently.
Anyhow, this ticket solves the warnings - one of them by extending the exclusion in the script that analyses Doxygen output.
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