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

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:


New changeset 4533494ac553273239c809053b54c0ab783a0c78 by Serhiy Storchaka (Andrés Delfino) in branch '3.6':
[3.6] bpo-33280: Reorganize external Tcl/Tk references. (GH-6473). (#6602)
https://github.com/python/cpython/commit/4533494ac553273239c809053b54c0ab783a0c78


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