fix typo: relaod -> reload (#6235)

[ti-chi-bot]

This is an automated cherry-pick of #6235

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• This PR is translated from: fix typo: relaod -> reload docs-cn#6931
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• TomShawn

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[TomShawn]

@en-jin19 Please help modify the third relaod typo in this cherry-pick PR. Thanks!

[en-jin19]

@en-jin19 Please help modify the third relaod typo in this cherry-pick PR. Thanks!

In the 5.0 English version, there are two typos that existed, and they have been fixed in this PR, so I think there is no more typo that needed to be fixed here.

But in the 5.0 Chinese version, there are three typos, so I have added the third one in the PR pingcap/docs-cn#6960. PTAL, thanks!

[TomShawn]

/merge

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

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Commit hash: 921045a