[llvm] Revert "LangRef: Clarify llvm.minnum and llvm.maxnum about sNaN and signed zero (#112852)" (PR #138451)

[Phoebe Wang via llvm-commits]

https://github.com/phoebewang approved this pull request.

I'm voting for this. If we have disputes for any additional changes, it's always good to revert to the initial states at least.

https://github.com/llvm/llvm-project/pull/138451