PEP 689: Tweak a policy, add canonical-doc and Mark as Final (GH-3123)

conf.py

@@ -49,6 +49,7 @@
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3/', None),
     'packaging': ('https://packaging.python.org/en/latest/', None),
+    'devguide': ('https://devguide.python.org/', None),
     'py3.11': ('https://docs.python.org/3.11/', None),
     'py3.12': ('https://docs.python.org/3.12/', None),
 }

pep-0689.rst

@@ -2,7 +2,7 @@ PEP: 689
 Title: Unstable C API tier
 Author: Petr Viktorin <encukou@gmail.com>
 Discussions-To: https://discuss.python.org/t/pep-689-unstable-c-api-tier/20452
-Status: Accepted
+Status: Final
 Type: Standards Track
 Content-Type: text/x-rst
 Requires: 523
@@ -13,6 +13,10 @@ Post-History: `27-Apr-2022 <https://mail.python.org/archives/list/python-dev@pyt
               `27-Oct-2022 <https://discuss.python.org/t/pep-689-unstable-c-api-tier/20452>`__,
 Resolution: https://discuss.python.org/t/pep-689-unstable-c-api-tier/20452/13
 
+.. canonical-doc:: :ref:`devguide:c-api`
+
+   User-facing documentation is at :ref:`py3.12:unstable-c-api`.
+
 
 Abstract
 ========
@@ -152,8 +156,7 @@ Several rules for dealing with the unstable tier will be introduced:
 -  To move an API from the unstable tier to the public tier, it should be
    exposed without the ``PyUnstable_*`` prefix.
 
-   The old name should remain available until the first incompatible change
-   is made or the API is removed.
+   The old name should remain available until the API is deprecated or removed.
 
 -  Adding new unstable API *for existing features* is allowed even after
    Beta feature freeze, up until the first Release Candidate.