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gh-82006: IDLE doc improvements (#94349)

0. Update text start and stop conditions.
1. Title-case sections but not subsections.
2. Edit Shell Window sections: title, execute, restart.
T
Terry Jan Reedy committed
e6391e08bff775a3c10707fd2cfce6963e6ae429
Parent: edb10ca
Committed by GitHub <noreply@github.com> on 6/27/2022, 10:59:26 PM