[clang] [clang] Fix incorrect 'namespace' in diagnostic for out-of-line declarations (PR #230630)

[Yanzuo Liu via cfe-commits]

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@@ -9063,7 +9063,7 @@ def err_typecheck_deleted_function : Error<
 def err_expected_class_or_namespace : Error<"%0 is not a class"
   "%select{ or namespace|, namespace, or enumeration}1">;
 def err_invalid_declarator_scope : Error<"cannot define or redeclare %0 here "
-  "because namespace %1 does not enclose namespace %2">;
+  "because namespace %1 does not enclose %select{namespace|struct|class|union|enum}2 %3">;
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zwuis wrote:

Use `%enum_select`.

https://clang.llvm.org/docs/InternalsManual.html#formatting-a-diagnostic-argument

https://github.com/llvm/llvm-project/pull/230630