As mentioned in our Readme, Contributing Guide, PEP 1, PEP 12, etc., non-Draft Standards Track PEPs are generally considered historical documents and not generally modified after acceptance/rejection/withdrawal, outside of rendering/syntax errors or other special circumstances. In particular, this is a Withdrawn PEP, so there is little reason to change it, and it is far more valuable to direct the efforts of contributors and reviewers toward PEPs that are Draft or Active, where the changes are much more likely to mean something.

IMO, the conforming of typographical quotes to apostrophes (single quotes) adds diff noise for no meaningful change in the rendered output. As such, from a PEP editor perspective I'm not so fond of it at least as-is, but as it does also fix a small typo, I will leave it to the PEP author and editor @brettcannon to make the the final call.