[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 67a8f4fed3169e1b8c947c10f6e06863e399ae32 by Serhiy Storchaka (Andrés Delfino) in branch 'master':
bpo-33280: Reorganize external Tcl/Tk references. (GH-6473)
https://github.com/python/cpython/commit/67a8f4fed3169e1b8c947c10f6e06863e399ae32


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