Update Release Notes

Author: spavloff

clang/docs/ReleaseNotes.rst

@@ -702,6 +702,11 @@ Improvements to Clang's diagnostics
 - Improve the diagnostics for placement new expression when const-qualified
   object was passed as the storage argument. (#GH143708)
 
+- Clang now does not issue a warning about returning from a function declared with
+  the ``[[noreturn]]`` attribute when the function body is ended with a call via
+  pointer, provided it can be proven that the pointer only points to
+  ``[[noreturn]]`` functions..
+
 Improvements to Clang's time-trace
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