[clang] [analyzer] Modernize, improve and promote chroot checker (PR #117791)

[Balazs Benics via cfe-commits]

================
@@ -1750,6 +1750,21 @@ Critical section handling functions modeled by this checker:
    }
  }
 
+.. _unix-Chroot:
+
+unix.Chroot (C)
+"""""""""""""""""""""
----------------
steakhal wrote:

```suggestion
unix.Chroot (C)
"""""""""""""""
```

https://github.com/llvm/llvm-project/pull/117791