[clang-tools-extra] added option `google-readability-namespace-comments.AllowNoNamespaceComments` (PR #124265)

[Thorsten Klein via cfe-commits]

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@@ -187,6 +187,11 @@ Changes in existing checks
   <clang-tidy/checks/concurrency/mt-unsafe>` check by fixing a false positive
   where ``strerror`` was flagged as MT-unsafe.
 
+- Improved :doc:`google-readability-namespace-comments
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thorsten-klein wrote:

> Shall I run the tests for this llvm-namespace-comment check as well (e.g. a separate RUN)?

OK. This does not make sense. Then google and llvm checks would be mixed in one .cpp file. And additionally the `CHECK-MESSAGES` is not compatible. 

https://github.com/llvm/llvm-project/pull/124265