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>
(cherry picked from commit b74c819fab86bedc9b962ea42cfb9b5893fd2dda)

Co-authored-by: giovanniwijaya <16949408+giovanniwijaya@users.noreply.github.com>

Miss Islington (bot) committed 4y ago

03c7b358406f6660a5ef13b32ace8c67871440f1

Parent: 897e5aa

Committed by GitHub <noreply@github.com> on 9/10/2021, 9:34:07 PM