[docs] [issue34605] Avoid master/slave terminology

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Tkinter and IDLE are full of "master" variables:

   master: parent for widgets.

It seems to be a keep concept of Tkinter windows.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34605>
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