In ast doc, update 'below' to 'above' (GH-94967)

The included asdl file was moved from 'below' to 'above' in 3.9.
(cherry picked from commit 7b617be4ab6df871cfa9d2127908cb1373578dc0)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Miss Islington (bot) committed 3y ago

37ec0bdf16006e4a1eaaae60ca40201f55a3240a

Parent: ec6ed66

Committed by GitHub <noreply@github.com> on 7/18/2022, 4:46:26 PM