[libc-commits] [libc] [libc][docs] Add guide for implementing a function (PR #188499)

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Sukumarsawant wrote:

If this is related
<img width="1243" height="636" alt="image" src="https://github.com/user-attachments/assets/6b2a9d1a-cade-4a1a-abce-35b6c9c011dc" />


https://github.com/llvm/llvm-project/pull/188499