cloud: add private link firewall rules for clusters on AWS and Alibaba Cloud

[hfxsd]

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[gemini-code-assist]

Code Review

This pull request adds a new step, 'Authorize your private endpoint in TiDB Cloud', to the documentation for setting up private endpoint connections on Alibaba Cloud and TiDB Cloud Serverless. The review feedback identifies several issues: a copy-paste error referencing AWS in the Alibaba Cloud guide, inconsistent anchor links and text in the tables of contents, and heading punctuation that violates the repository style guide.

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[sanshuiyijing]

lgtm

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[qiancai]

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[hfxsd]

/retest