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Fix incorrect double indent in ast doc (#94976)

Warning directive indent was 4 rather than 3 spaces.
T
Terry Jan Reedy committed
a25a803c4c452c70da11be3e80004b47646bff4c
Parent: daf68ba
Committed by GitHub <noreply@github.com> on 7/18/2022, 5:24:18 PM