[libc-commits] [libc] [libc][docs] Generate docs for signal.h & optimized is_implemented func (PR #88028)

[Nick Desaulniers via libc-commits]

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+signal.h Functions
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nickdesaulniers wrote:

You're going to need an include akin to e127997155a1cd1c5692c42aad074064c8dad099 else we'll break the build again.

Run `ninja docs-libc-html` to build the docs and verify the build isn't broken.

You'll probably need to configure llvm-libc with `-DLLVM_ENABLE_SPHINX=ON -DLIBC_INCLUDE_DOCS=ON` cmake options for that `ninja` target to be recognized.

https://github.com/llvm/llvm-project/pull/88028