Fix more Markdownlint errors in docs
What does this Merge Request do?
Fixes the remaining (at time of pushing this branch) Markdown lint errors.
Related to gitlab#32881 (closed)
Merge Request checklist
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Tests added for new functionality. If not, please raise Issue to follow-up. -
This change is backward compatible. If not, please include steps to communicate to our users. -
Documentation added/updated, if needed. -
gdk doctor
test added, if needed.