sql-plan-replayer: add description for PLAN REPLAYER CAPTURE REMOVE

[time-and-fate]

What is changed, added or deleted? (Required)

Add description for how to remove PLAN REPLAYER CAPTURE to make docs complete

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v8.1 (TiDB 8.1 versions)
• v8.0 (TiDB 8.0 versions)
• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): executor: support plan replayer capture remove task tidb#41258

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[lilin90]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-21 07:13:13.061387327 +0000 UTC m=+2155746.818522900: ☑️ agreed by lilin90.

[ti-chi-bot]

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[lilin90]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #17424.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #17425.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #17426.