[clang] [clang][analyzer] Move unix.BlockInCriticalSection out of alpha (PR #93815)

[Balazs Benics via cfe-commits]

================
@@ -1235,6 +1235,49 @@ Check calls to various UNIX/Posix functions: ``open, pthread_once, calloc, mallo
 .. literalinclude:: checkers/unix_api_example.c
     :language: c
 
+.. _unix-BlockInCriticalSection:
+
+unix.BlockInCriticalSection (C)
+"""""""""""""""""""""""""""""""""""""
----------------
steakhal wrote:

```suggestion
unix.BlockInCriticalSection (C, C++)
""""""""""""""""""""""""""""""""""""
```

https://github.com/llvm/llvm-project/pull/93815