Add docs for "transaction deadline exceeded" error, again #4676
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(Still) fixes #4552.
Original discussion in #4667 . This change fixes a technical error I introduced while copy-editing some text of that PR.
Summary of changes (is still):
Update 'Common Errors' page with:
the retry error message
a recommendation that the user add retries to their app
a description of the state that leads to such errors (kindly
contributed by Andrei Matei)
also spruced up the txn restart section intro with some links to
reference docs on how txns work in CockroachDB for the curious.