[docs] [issue23220] Documents input/output effects of how IDLE runs user code

[Martin Panter]

Martin Panter added the comment:

I wouldn’t say TK ignores carriage returns, though I agree it would be better if Idle stripped them out. Currently I get a glyph displayed for them, similarly to \b. They wouldn’t copy to my clipboard, so I fudged them after pasting here:

>>> _ = stdout.write("CRLF\r\n")  # Linux: box-drawing corner piece
CRLF┌
>>> _ = stdout.write("CRLF\r\n")  # Wine: euro sign
CRLF€

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<http://bugs.python.org/issue23220>
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