[clang-tools-extra] [clang-tidy] Rename google-build-namespaces to misc-anonymous-namespace-in-header (PR #173484)

[via cfe-commits]

================
@@ -1,10 +1,10 @@
 .. title:: clang-tidy - fuchsia-header-anon-namespaces
 .. meta::
-   :http-equiv=refresh: 5;URL=../google/build-namespaces.html
+   :http-equiv=refresh: 5;URL=../misc/anonymous-namespace-in-header.html
 
 fuchsia-header-anon-namespaces
 ==============================
 
-The fuchsia-header-anon-namespaces check is an alias, please see
-:doc:`google-build-namespace <../google/build-namespaces>`
+The `fuchsia-header-anon-namespaces` check is an alias, please see
+:doc:`the new check <../misc/anonymous-namespace-in-header>`
----------------
zeyi2 wrote:

```suggestion
:doc:`misc-anonymous-namespace-in-header <../misc/anonymous-namespace-in-header>`
```

https://github.com/llvm/llvm-project/pull/173484