Update peps/pep-0813.rst

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: warsaw

peps/pep-0813.rst

@@ -197,7 +197,7 @@ Open Issues
 ===========
 
 The output format and APIs are heavily inspired by `Rich
-<https://rich.readthedocs.io/en/latest/pretty.html#rich-repr-protocol>`_.  The idea is that Rich could
+<rich-repr-protocol_>`_. The idea is that Rich could
 implement an API compatible with ``print(..., pretty=RichPrinter)`` fairly easily.  Rich's API is designed to
 print constructor-like representations of instances, which means that it's not possible to control much of the
 "class chrome" around the arguments.  Rich does support using angle brackets (i.e. ``<...>``) instead of