[docs] [issue33283] Mention PNG as a supported image format by Tcl/Tk

[miss-islington]

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


New changeset b88f73749db98ed62dbc8fa59480aa62202e25d7 by Miss Islington (bot) in branch '3.7':
bpo-33283: Mention PNG as a supported format by Tcl/Tk. (GH-6479)
https://github.com/python/cpython/commit/b88f73749db98ed62dbc8fa59480aa62202e25d7


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