PEP 770: Add canonical specification (#4418)

Author: sethmlarson

peps/pep-0770.rst

@@ -13,6 +13,8 @@ Post-History:
   `06-Jan-2025 <https://discuss.python.org/t/76308>`__,
 Resolution: `11-Apr-2025 <https://discuss.python.org/t/76308/112>`__
 
+.. canonical-pypa-spec:: https://packaging.python.org/en/latest/specifications/binary-distribution-format/#the-dist-info-sboms-directory
+
 Abstract
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