[docs] [issue23220] IDLE: Document how Shell displays user code output

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I merged a first edition of the new section.  It does not include Mac behavior, so will need revision.  But I want to do some experiments with tk/inter on various systems before doing so.

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dependencies: +IDLE Doc: Text consumes unlimited RAM, consoles likely not
stage: patch review -> needs patch

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