PEP 590: Mark as Final (#3598)

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

Author: hugovk

peps/pep-0590.rst

@@ -4,11 +4,12 @@ Author: Mark Shannon <mark@hotpy.org>, Jeroen Demeyer <J.Demeyer@UGent.be>
 BDFL-Delegate: Petr Viktorin <encukou@gmail.com>
 Status: Accepted
 Type: Standards Track
-Content-Type: text/x-rst
 Created: 29-Mar-2019
 Python-Version: 3.8
 Post-History:
 
+.. canonical-doc:: :ref:`python:vectorcall`
+
 Abstract
 ========
 
@@ -323,14 +324,3 @@ Copyright
 =========
 
 This document has been placed in the public domain.
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