Use native PEP link

pep-0655.rst

@@ -14,7 +14,7 @@ Post-History: 31-Jan-2021, 11-Feb-2021, 20-Feb-2021, 26-Feb-2021, 17-Jan-2022
 Abstract
 ========
 
-`PEP 589 <https://www.python.org/dev/peps/pep-0589/>`__ defines syntax
+:pep:`589` defines syntax
 for declaring a TypedDict with all required keys and syntax for defining
 a TypedDict with `all potentially-missing
 keys <https://www.python.org/dev/peps/pep-0589/#totality>`__ however it
@@ -488,8 +488,7 @@ Replace Optional with Nullable. Repurpose Optional to mean “optional item”.
 ---------------------------------------------------------------------------
 
 ``Optional[]`` is too ubiquitous to deprecate. Although use of it
-*may* fade over time in favor of the ``T|None`` syntax specified by `PEP
-604 <https://www.python.org/dev/peps/pep-0604/>`__.
+*may* fade over time in favor of the ``T|None`` syntax specified by :pep:`604`.
 
 
 Change Optional to mean “optional item” in certain contexts instead of “nullable”