Add release note under "Potentially Breaking Changes"

Author: naveen-seth

clang/docs/ReleaseNotes.rst

@@ -82,6 +82,8 @@ Potentially Breaking Changes
 - Downstream projects that previously linked only against ``clangDriver`` may
   now (also) need to link against the new ``clangOptions`` library, since
   options-related code has been moved out of the Driver into a separate library.
+- The ``clangFrontend`` library no longer depends on ``clangDriver``, which may
+  break downstream projects that relied on this transitive dependency.
 - Clang now supports MSVC vector deleting destructors when targeting Windows.
   This means that vtables of classes with virtual destructors will contain a
   pointer to vector deleting destructor (instead of scalar deleting destructor)