[clang] [clang][Diagnostic] Clarify error message for auto (PR #149781)

[Yanzuo Liu via cfe-commits]

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@@ -398,6 +398,8 @@ Improvements to Clang's diagnostics
 - Clang now emits a diagnostic in case `vector_size` or `ext_vector_type`
   attributes are used with a negative size (#GH165463).
 
+- Improved diagnostic location for templates declared inside local classes.
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zwuis wrote:

Please reference the issue fixed by this patch like other entries.

https://github.com/llvm/llvm-project/pull/149781