fix the description of wal_dir

[SpadeA-Tang]

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[ti-chi-bot]

Hi @SpadeA-Tang. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-06 08:19:46.686640613 +0000 UTC m=+258512.253410504: ☑️ agreed by ran-huang.

[ran-huang]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ran-huang

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[ran-huang]

/ok-to-test

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #16530.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #16531.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-4.0: #16532.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.3: #16533.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #16534.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16535.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16536.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #16537.