Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/clang-tools-extra/docs/clang-tidy/checks/google-build-namespaces.rst

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+.. title:: clang-tidy - google-build-namespaces
+
+google-build-namespaces
+=======================
+
+`cert-dcl59-cpp` redirects here as an alias for this check.
+
+Finds anonymous namespaces in headers.
+
+https://google.github.io/styleguide/cppguide.html#Namespaces
+
+Corresponding cpplint.py check name: `build/namespaces`.
+
+Options
+-------
+
+.. option:: HeaderFileExtensions
+
+   A comma-separated list of filename extensions of header files (the filename
+   extensions should not include "." prefix). Default is "h,hh,hpp,hxx".
+   For header files without an extension, use an empty string (if there are no
+   other desired extensions) or leave an empty element in the list. e.g.,
+   "h,hh,hpp,hxx," (note the trailing comma).