tidb-configuration-file: add more notes to txn-entry-size-limit (#12595)

[ti-chi-bot]

This is an automated cherry-pick of #12595

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

• 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
• Other reference link(s):

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

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

/merge

[ti-chi-bot]

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

Commit hash: 0e5c68e