develop: fix typo for stale

[Tetsuya3850]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

I fixed the typo where it should be "stale read" but was "steal read"

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• v6.5 (TiDB 6.5 versions)
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• Delete files
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qiancai
• tangenta

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[ti-chi-bot]

Welcome @Tetsuya3850!

It looks like this is your first PR to pingcap/docs 🎉.

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Thank you, and welcome to pingcap/docs. 😃

[Tetsuya3850]

/cc @ran-huang

[Tetsuya3850]

/cc @tangenta

[qiancai]

Hi @Tetsuya3850,
Thanks a lot for the catch and fix.

[qiancai]

/merge

[ti-chi-bot]

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

Commit hash: ac457f5

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #13019.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #13020.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #13021.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.6: #13022.