Update release note for the fix

Author: hazohelet

clang/docs/ReleaseNotes.rst

@@ -394,7 +394,8 @@ Improvements to Clang's diagnostics
   (`#62353: <https://github.com/llvm/llvm-project/issues/62353>`_,
   fallout from the non-POD packing ABI fix in LLVM 15).
 - Clang constexpr evaluator now prints subobject's name instead of its type in notes
-  when a constexpr variable has uninitialized subobjects after its constructor call.
+  when a constexpr variable has uninitialized member subobjects or base class subobjects
+  after its constructor call.
   (`#58601 <https://github.com/llvm/llvm-project/issues/58601>`_)
 - Clang's `-Wshadow` warning now warns about shadowings by static local variables
   (`#62850: <https://github.com/llvm/llvm-project/issues/62850>`_).