[clang] [clang-tools-extra] [Clang][Sema] Clarify structured binding diagnostic when initializer is missing (PR #181803)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

> According to the content in [#181803 (comment)](https://github.com/llvm/llvm-project/pull/181803#discussion_r2816948888) , I think this PR uses AI to fix good first issue, which violates LLVM AI Policy. I will no longer review this PR.

@zwuis  While #181579 is very clearly undisclosed use of AI, I don't see any real signs of that in this PR?


https://github.com/llvm/llvm-project/pull/181803