PEP 797: Update the reference implementation URL (#4828)

Author: ZeroIntensity

peps/pep-0797.rst

@@ -404,8 +404,8 @@ New APIs and important information about how to use them will be added to the
 Reference Implementation
 ========================
 
-The reference implementation of this PEP can be found
-`here <https://github.com/python/cpython/compare/main...ZeroIntensity:cpython:shared-object-proxy>`_.
+A reference implementation of this PEP can be found at
+`python/cpython#145150 <https://github.com/python/cpython/pull/145150>`_.
 
 Rejected Ideas
 ==============
@@ -426,7 +426,8 @@ Acknowledgements
 ================
 
 This PEP would not have been possible without discussion and feedback from
-Eric Snow, Petr Viktorin, Kirill Podoprigora, Adam Turner, and Yury Selivanov.
+Eric Snow, Petr Viktorin, Kirill Podoprigora, Adam Turner, Yury Selivanov, and
+Steve Dower.
 
 Copyright
 =========