Add docs checks to GH workflows

[rkratky]

This adds the following automated docs checks to GH Actions:

• spellcheck
• linkcheck
• inclusive-language check

(Fixes FR-5662)

[dbungert]

This should be fine. But as the tests are failing at the moment I'm curious to see the final result.

[rkratky]

I fixed the invocation of the test (inclusive lang.) that failed to run, and it's now running and passing.

The last failing test is spellcheck, which is fixed by #1847 (when that PR is merged, the spellcheck should be passing).

[dbungert]

I am cancelling and restarting the stuck jobs.

[dbungert]

The spelling check failed on 2 items, however they don't fail when run locally. I presume there is a slight difference in the dictionaries between the two test run cases.

I have pushed a commit with proposed fixes for these, please incorporate or re-implement as you see fit, @rkratky .

[rkratky]

Thanks, @dbungert. Merging with your commit as is.

(Though I cannot fathom what dictionary could exclude 'boolean'... And for 'runtime', most style guides allow for both forms ('runtime' and 'run time'), so I'll add it to the wordlist in the next iteration, too.)