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

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

(As a side note to Sehiy and others, as of 2.7.15, we no longer ship any python.org macOS binary installers that link with Tcl/Tk 8.4 and we also now ship at least one installer variant for 2.7.x and 3.6.x that provides Tcl/Tk 8.6.  3.7.0 will be only 8.6 and perhaps 2.7.x and 3.6.x will drop 8.5 in a future release. Of course, there may still be other platforms that use 8.4.)

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nosy: +ned.deily

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<https://bugs.python.org/issue33283>
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