[docs] [issue33280] Update link to Tcl/Tk 8.6 man pages in tkinter.rst

[miss-islington]

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


New changeset 53d36cc961ff2080fa91a216cce718295259d723 by Miss Islington (bot) in branch '3.7':
bpo-33280: Reorganize external Tcl/Tk references. (GH-6473)
https://github.com/python/cpython/commit/53d36cc961ff2080fa91a216cce718295259d723


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nosy: +miss-islington

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