[issue23156] Update tix install information in tkinter tix chapter of doc

[Cheryl Sabella]

Cheryl Sabella <cheryl.sabella at gmail.com> added the comment:

Since tix has been deprecated since 3.6 (according to the docs with commit bd63353b7433ea8aa831ffb158ac29fb646a6fc9), should this ticket be closed as out of date?

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nosy: +cheryl.sabella

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue23156>
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