docs: fix typos and clarify documentation #2334
Merged
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Checklist
yarn install
,yarn test
run successfully? yesDescription
This PR combines a number of open documentation PRs which have CLA issues, haven't responded to review feedback, are pending review for many months, etc. It also adds some additional documentation cleanup for
It also updates the AngularFireMessaging docs to point to the related issue in the Angular repo (asking them to thumbs up the issue) rather than asking them to create new duplicate issues.