resouce control: add desp about QUERY WATCH REMOVE RESOURCE GROUP

[lhy1024]

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[qiancai]

@lhy1024 Please involve a technical reviewer for this PR.

[glorv]

LGTM

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@glorv: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[qiancai]

Rest LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-05-06 09:41:31.056325937 +0000 UTC m=+348138.239229181: ☑️ agreed by qiancai.

[qiancai]

Hi @lhy1024, could you please confirm which version of TiDB this PR applies to? Thanks.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

@lhy1024: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	22889df	link	true	/test pull-verify

Full PR test history. Your PR dashboard.

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[lhy1024]

Hi @lhy1024, could you please confirm which version of TiDB this PR applies to? Thanks.

Sprint 28/v9.0.0-beta.2