[Clang] Updated the clang release notes

Author: TilakChad

clang/docs/ReleaseNotes.rst

@@ -1007,6 +1007,7 @@ Bug Fixes to C++ Support
 - Fix type of expression when calling a template which returns an ``__array_rank`` querying a type depending on a
   template parameter. Now, such expression can be used with ``static_assert`` and ``constexpr``. (#GH123498)
 - Correctly determine the implicit constexprness of lambdas in dependent contexts. (#GH97958) (#GH114234)
+- Fixed a clang regression on c++20 mode where unresolved dependent call expressions were created inside non-dependent context (#GH122892)
 
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^