[Clang] Update release notes. NFC.

Author: dtcxzyw

clang/docs/ReleaseNotes.rst

@@ -44,8 +44,9 @@ C/C++ Language Potentially Breaking Changes
 
 - Some old-style offsetof idioms like ``((int)(&(((struct S *)0)->field)))`` are treated
   as UB. To avoid breaking existing code, ``inbounds`` flags will not be set for such patterns.
-  However, it is still highly recommended to use the UB-free builtin ``__builtin_offsetof``.
-  (#GH130734)
+  However, it is still highly recommended to use the UB-free macro ``offsetof`` or clang builtin
+  function ``__builtin_offsetof``. It is also possible to use ``-fwrapv-pointer`` or 
+  ``-fno-delete-null-pointer-checks`` to make this behavior well-defined. (#GH130734, #GH130742)
 
 C++ Specific Potentially Breaking Changes
 -----------------------------------------