[v6.5.6] Documented resuming changefeed from Failed state (#15555) #15875
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This is an automated cherry-pick of #15555
What is changed, added or deleted? (Required)
From the Failed state the changefeed may be resumed (within the gc-ttl duration). For example, if a downstream issue is encountered for longer than 30 minutes the changefeed transitions to the Failure state. If that downstream issue is resolved within a few hours (less than the default 24 hour gc-ttl) the user may successfully resume the changefeed. This was not documented in the current overview.
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