no server.request-batch-enable-cross-command in v5.0.0 (#5419)

[ti-srebot]

cherry-pick #5419 to master
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# In docs repo:
git pr https://github.com/pingcap/docs/pull/5426

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git push git@github.com:ti-srebot/docs.git pr/5426:master-530e67b24cd8

---

same as pr 5414, the parameter is obsolete in v5.0.0

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[TomShawn]

/label require-LGT1
/lgtm

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[TomShawn]

/merge

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Commit hash: 8ef1f58