[issue41394] Document '_' in interpreter in shell tutorial

[wyz23x2]

wyz23x2 <wyz23x2 at 163.com> added the comment:

But there's nothing in https://docs.python.org/3/tutorial/interpreter.html. It should be stated there.

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components:  -Interpreter Core
nosy:  -xtreak
title: Make '_' behavior in shell more clear -> Document '_' in interpreter in shell tutorial

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41394>
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