Automatically detect capitalisation issues in docs contribs

[gberche-orange]

Why should it be implemented?

Manual feedback and timely fixes by @jfermi in kubeshop/testkube#3538 are great

Automating detection of such capitalisation issues in PR tests could provide timely contributor feedback on expected capitalizations

Describe the improvement

PR checks include doc checks on expected capitalization for common words.

Potential functional inspiration in https://github.com/openservicebrokerapi/servicebroker/blob/master/tools/verify-all.sh in particular https://github.com/openservicebrokerapi/servicebroker/blob/b299b631ccca921c8c813a79eef672d782da0923/tools/verify-phrases.sh#L26-L42

Additional context
Add any other context about the problem here if needed.

[aabedraba]

Super interesting!
Thanks. I can look into it sometime.