tiup: remove restriction for enable_tls (#11421)

[ti-chi-bot]

This is an automated cherry-pick of #11421

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

• This PR is translated from: Update tiup-cluster-topology-reference.md docs-cn#12099
• Other reference link(s):

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• Delete files
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• Need modification after applied to another branch
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[ti-chi-bot]

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• shichun-0415

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[shichun-0415]

/merge

[ti-chi-bot]

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

Commit hash: d8a58ae