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

[via cfe-commits]

================
@@ -1,10 +1,13 @@
 .. title:: clang-tidy - google-build-namespaces
+.. meta::
+   :http-equiv=refresh: 5;URL=../misc/anonymous-namespace-in-header.html
 
 google-build-namespaces
 =======================
 
-`cert-dcl59-cpp` redirects here as an alias for this check.
-`fuchsia-header-anon-namespaces` redirects here as an alias for this check.
+The `google-build-namespaces` check is an alias, please see
+:doc:`the new check <../misc/anonymous-namespace-in-header>`
----------------
zeyi2 wrote:

Could you try something like this?

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

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