Update markdownlint-cli2 dependency and use it for things
What does this MR do and why?
A newer version of markdownlint-cli2
is available: https://github.com/DavidAnson/markdownlint-cli2/releases/tag/v0.6.0.
We added markdownlint-cli2
to our linting image: !3213 (merged), but haven't done much with it yet.
This migrates a few things over to using it.
Merge request acceptance checklist
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I have evaluated the MR acceptance checklist for this merge request.