no server.request-batch-enable-cross-command in v5.0 (#6108)

[ti-srebot]

cherry-pick #6108 to master
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# In docs-cn repo:
git pr https://github.com/pingcap/docs-cn/pull/6109

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git push git@github.com:ti-srebot/docs-cn.git pr/6109:master-4ca88b74f19b

---

remove the config from v5.0

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Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v5.0 (TiDB 5.0 versions)
• v4.0 (TiDB 4.0 versions)
• v3.1 (TiDB 3.1 versions)
• v3.0 (TiDB 3.0 versions)
• v2.1 (TiDB 2.1 versions)

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[ti-srebot]

@dbsid please accept the invitation then you can push to the cherry-pick pull requests.
https://github.com/ti-srebot/docs-cn/invitations

[TomShawn]

/label require-LGT1
/lgtm

[ti-chi-bot]

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• TomShawn

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[TomShawn]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

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Commit hash: 84ce986