[clang-tools-extra] [clang-tidy][NFC] Fix broken link in documentation of cert-env33-c (PR #90216)

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NagyDonat wrote:

I'm merging this now, because switching all links to the new domain name has no immediate advantages (as long as the current one works) and would touch a dozen additional files. (By the way, the currently used domain name is also referenced in a LICENSE.TXT file and I didn't want to touch that.)

https://github.com/llvm/llvm-project/pull/90216