adjust the recommend value of raft election-timeout in multi dc deplo…

[glorv]

…yment

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• This PR is translated from: adjust the recommend value of raft election-timeout in multi dc deployment docs-cn#16468
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[qiancai]

Rest LGTM

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #16575.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #16576.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16577.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #16578.