add configuration description about isolation-read.engines & proxy-pr…

[shichun-0415]

…otocol.networks

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

• This PR is translated from: add configuration description about isolation-read.engines & proxy-protocol.networks docs-cn#7150, best practice: add link to tidb config networks docs-cn#10932
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[ti-chi-bot]

[REVIEW NOTIFICATION]

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[shichun-0415]

/verify

[pepezzzz]

LGTM

[Oreoxmt]

LGTM

[shichun-0415]

/remove status LGT1
/status LGT2

[shichun-0415]

/merge

[ti-chi-bot]

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

Commit hash: b2724ec

[Oreoxmt]

/verify

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #10024.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #10025.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #10026.