docs: add guidance for avoiding rate limits & GitHub's internal limit #39848
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Closes #39773.
Adds guidance around avoiding hitting rate limits when using rollout windows, as well as what it means when you encounter GitHub's cryptic "was submitted too quickly" error (tl;dr sux, plz wait an hour).
I also filed a follow-up issue to maybe try to automatically respect this internal GitHub limit, as it's come up with a couple different customers and it's always confusing.
Test plan
Just a docs change.