docs(nodejs): version support policy edits (#1346)

[gcf-owl-bot]

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[tmatsuo]

The docs test is failing with:

Error: Detected 1 broken links.
 docs/v1p1beta1.AdaptationClient.html
   [404] docs/speech-to-text/docs/endpoints

[tmatsuo]

I think the docs failure is a false positive. Also it's nothing to do with the changes in the PR.