IDLE: adjust Python version in doc url for 3.10+ (GH-28228)

Expression 'python_version()[:3]' truncated '3.10.0' to '3.1' instead of '3.10'.

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

giovanniwijaya committed 4y ago

b74c819fab86bedc9b962ea42cfb9b5893fd2dda

Parent: f8d624d

Committed by GitHub <noreply@github.com> on 9/10/2021, 9:10:28 PM