chore: update Vale spelling checker to v3

[koozz]

Add author names to accepted list as well as company names.

This should remove the clutter from the spell checker.
There are some obvious spelling errors visible now, these can be fixed in a separate pull request.

The new Vale (i.e. for MacOS brew install vale, at the time of writing 3.3.0) will run nicely with the configuration in this repository.

> vale ospo-book/content/en

ospo-book/content/en/glossary.md
 39:63  error  Use 'InnerSource' instead of    Vale.Terms
               'innerSource'.
 72:44  error  Did you really mean             Vale.Spelling
               'interoperate'?
 80:46  error  Did you really mean 'Chai'?     Vale.Spelling

...

✖ 24 errors, 0 warnings and 0 suggestions in 15 files.

These content changes can be picked up in a new pull request, that way, the reviewers can have another look.

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[cjyabraham]

LGTM

[anajsana]

Thanks for the review @cjyabraham ! Merging!