[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 1c6c8510f91fcd9d46a8ce9155d8c2689d7df92b by Serhiy Storchaka (Andrés Delfino) in branch '2.7':
[2.7] bpo-33280: Reorganize external Tcl/Tk references. (GH-6473). (GH-6607)
https://github.com/python/cpython/commit/1c6c8510f91fcd9d46a8ce9155d8c2689d7df92b


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