Clarify use of topologySpreadConstraints

[ran-huang]

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• master (the latest development version)
• v1.5 (TiDB Operator 1.5 versions)
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What is the related PR or file link(s)?

• This PR is translated from: Clarify use of topologySpreadConstraints #2448
• Other reference link(s):

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-06 07:09:24.798597641 +0000 UTC m=+3455362.385707771: ☑️ agreed by csuzhangxc.
• 2023-11-06 08:02:15.846024198 +0000 UTC m=+3458533.433134342: ☑️ agreed by Oreoxmt.

[ran-huang]

/approve

[ti-chi-bot]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-1.5: #2465.