[clang] [clang] Document the type_visibility attribute (PR #79157)

[Aaron Ballman via cfe-commits]

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@@ -5557,6 +5557,21 @@ See :doc:`LTOVisibility`.
   }];
 }
 
+def TypeVisibilityDocs : Documentation {
+  let Category = DocCatType;
+  let Content = [{
+The ``type_visibility`` attribute allows the ELF visibility of a type and its vague
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AaronBallman wrote:

Does this only impact ELF or does this also impact say PE32?

https://github.com/llvm/llvm-project/pull/79157