PEP 692: Update Reference Implementation section (#2779)

pep-0692.rst

@@ -531,12 +531,11 @@ the `mypy documentation <https://mypy.readthedocs.io/>`_ and the
 Reference Implementation
 ========================
 
-There is a proof-of-concept implementation of typing ``**kwargs`` using
-``TypedDict`` as a `pull request to mypy <mypyPull10576_>`__
-and `to mypy_extensions <mypyExtensionsPull22_>`__.
-The implementation uses ``Expand`` instead of ``Unpack``.
+The `mypy type checker <https://github.com/python/mypy>`_ already 
+`supports <https://github.com/python/mypy/pull/13471>`_ more precise
+``**kwargs`` typing using ``Unpack``.
 
-The `Pyright type checker <https://github.com/microsoft/pyright>`_
+`Pyright type checker <https://github.com/microsoft/pyright>`_ also
 `provides provisional support <pyrightProvisionalImplementation_>`__
 for `this feature <pyrightIssue3002_>`__.
 
@@ -582,8 +581,6 @@ References
 
 .. _httpxIssue1384: https://github.com/encode/httpx/issues/1384
 .. _mypyIssue4441: https://github.com/python/mypy/issues/4441
-.. _mypyPull10576: https://github.com/python/mypy/pull/10576
-.. _mypyExtensionsPull22: https://github.com/python/mypy_extensions/pull/22/files
 .. _pyrightIssue3002: https://github.com/microsoft/pyright/issues/3002
 .. _pyrightProvisionalImplementation: https://github.com/microsoft/pyright/commit/5bee749eb171979e3f526cd8e5bf66b00593378a
 .. _cpythonGrammarChangePoc: https://github.com/python/cpython/compare/main...franekmagiera:annotate-kwargs