flashback: add limitation with stale read/snapshot

[qiancai]

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• This PR is translated from: flashback: add limitation with stale read/snapshot docs-cn#18903
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[3pointer]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-08 07:09:58.430303183 +0000 UTC m=+1197711.269458732: ☑️ agreed by 3pointer.