[clang] [clang][AMDGPU] Update amdgpu_waves_per_eu attr docs (PR #74587)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Pierre van Houtryve (Pierre-vh)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/74587.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/AttrDocs.td (+3-2) 


``````````diff
diff --git a/clang/include/clang/Basic/AttrDocs.td b/clang/include/clang/Basic/AttrDocs.td
index bbe4de94cbabe..88f7c65e6e847 100644
--- a/clang/include/clang/Basic/AttrDocs.td
+++ b/clang/include/clang/Basic/AttrDocs.td
@@ -2659,8 +2659,9 @@ An error will be given if:
   - Specified values violate subtarget specifications;
   - Specified values are not compatible with values provided through other
     attributes;
-  - The AMDGPU target backend is unable to create machine code that can meet the
-    request.
+
+The AMDGPU target backend will emit a warning whenever it is unable to
+create machine code that meets the request.
   }];
 }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/74587