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

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset ebb08beb08461eb5f147aaca6f86cafa4ea15bff by Miss Islington (bot) in branch '3.7':
bpo-23156: Remove obsolete tix install directions (GH-11595)
https://github.com/python/cpython/commit/ebb08beb08461eb5f147aaca6f86cafa4ea15bff


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nosy: +miss-islington

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<https://bugs.python.org/issue23156>
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