Comment on release concurrency in the docs
Comment on release concurrency in the docs

Proposing for discussion. It's possible that we want to say that we _won't_ have multiple stable branches at once, but I think that that would mean we were not releasing master often enough.

- Comment on release concurrency in the docs
- Fix a few typos

Testing Done:
rendered version attached

Reviewed at https://rbcommons.com/s/twitter/r/3827/

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