tidb-configuration-file: add more notes to txn-entry-size-limit

[TomShawn]

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• This PR is translated from: tidb-configuration-file: add more notes to txn-entry-size-limit docs#10629 system-variables: Update link to PHP docs docs#10373
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[CbcWestwolf]

这里的说法要和表中其它行维持一致嘛？比如 6 MiB => 6291456 字节，120 MiB => 125829120 字节

[TomShawn]

done

[TomShawn]

/status LGT1

[TomShawn]

/merge

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

Commit hash: 9df0065

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #12645.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.3: #12646.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #12647.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #12648.