[clang-tools-extra] [clang-tidy] Provide fix-its for downcasts in google-readability-casting (PR #165411)

[via cfe-commits]

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@@ -334,6 +334,10 @@ Changes in existing checks
   adding an option to allow pointer arithmetic via prefix/postfix increment or
   decrement operators.
 
+- Improved :doc:`google-readability-casting
+  <clang-tidy/checks/google/readability-casting>` check by adding a fix-it
+  for downcasts.
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EugeneZelenko wrote:

`notes` for for downcasts?

https://github.com/llvm/llvm-project/pull/165411