[clang] [clang] [docs] Clarify the issue with compiler-rt on Windows/MSVC (PR #106875)

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h-vetinari wrote:

> See e.g. https://discourse.llvm.org/t/improve-autolinking-of-compiler-rt-and-libc-on-windows-with-lld-link/71392 for a discussion on how to improve this situation.

Xref https://github.com/llvm/llvm-project/issues/63827


https://github.com/llvm/llvm-project/pull/106875