[FOLD] add release note

Author: sdkrystian

clang/docs/ReleaseNotes.rst

@@ -292,6 +292,8 @@ Bug Fixes to C++ Support
 - Correctly check constraints of explicit instantiations of member functions. (#GH46029)
 - Fixed an assertion failure about a constraint of a friend function template references to a value with greater
   template depth than the friend function template. (#GH98258)
+- Clang now rebuilds the template parameters of out-of-line declarations and specializations in the context
+  of the current instantiation in all cases.
 
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^