[issue35833] IDLE: revise doc for control chars sent to Shell

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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keywords: +patch, patch, patch
pull_requests: +11807, 11808, 11809
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35833>
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