[docs] [issue14944] Setup & Usage documentation for pydoc, IDLE, & 2to3

[Terry J. Reedy]

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

idle.html, derived from idle.rst, is now the IDLE help file.

pip also has pip3 command; perhaps ensurepip should be mentioned.

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versions: +Python 3.8 -Python 3.6

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