[docs] [issue38053] Update plistlib documentation

Mon Sep 9 09:05:54 EDT 2019

Jon Janzen <jjjonjanzen at gmail.com> added the comment:

>* Remove notes about the new API being added in 3.4 since 3.4 is no longer supported

Per discussion in the PR, this is no longer a goal of this issue

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<https://bugs.python.org/issue38053>
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