[CAPTCHA] editorial corrections merged

Dear colleagues,
A Pull Request submitted to the APA repository corrected some editorial errors and inconsistencies in the CAPTCHA document related to the references to Google’s reCAPTCHA.
https://github.com/w3c/apa/pull/38

I have migrated this change to the new repository for CAPTCHA:
https://github.com/w3c/captcha-accessibility/

and it now appears on the main branch.

A separate Pull Request in the APA Repository, #224, sought to address some of the same issues. This I have now closed, with an explanation to the submitter.
https://github.com/w3c/apa/pull/224


If you have any concerns about these changes, you are welcome to open further issues or pull requests on GitHub or to comment on the mailing list.

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