PEP 560: Mark as Final (#3570)

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

peps/pep-0560.rst

@@ -1,14 +1,15 @@
 PEP: 560
 Title: Core support for typing module and generic types
 Author: Ivan Levkivskyi <levkivskyi@gmail.com>
-Status: Accepted
+Status: Final
 Type: Standards Track
-Content-Type: text/x-rst
 Created: 03-Sep-2017
 Python-Version: 3.7
 Post-History: 09-Sep-2017, 14-Nov-2017
 Resolution: https://mail.python.org/pipermail/python-dev/2017-December/151038.html
 
+.. canonical-doc:: :external+python:meth:`object.__class_getitem__` and
+                   :external+python:meth:`object.__mro_entries__`
 
 Abstract
 ========
@@ -316,14 +317,3 @@ Copyright
 =========
 
 This document has been placed in the public domain.
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