[clang][analyzer][NFC] Improve release note (#76805)

Author: benshi001

clang/docs/ReleaseNotes.rst

@@ -1127,9 +1127,10 @@ Improvements
 ^^^^^^^^^^^^
 
 - Improved the ``unix.StdCLibraryFunctions`` checker by modeling more
-  functions like ``send``, ``recv``, ``readlink``, ``fflush`` and
+  functions like ``send``, ``recv``, ``readlink``, ``fflush``, ``mkdtemp`` and
   ``errno`` behavior.
   (`52ac71f92d38 <https://github.com/llvm/llvm-project/commit/52ac71f92d38f75df5cb88e9c090ac5fd5a71548>`_,
+  `#76671 <https://github.com/llvm/llvm-project/pull/76671>`_,
   `#71373 <https://github.com/llvm/llvm-project/pull/71373>`_,
   `#76557 <https://github.com/llvm/llvm-project/pull/76557>`_,
   `#71392 <https://github.com/llvm/llvm-project/pull/71392>`_)