[docs] [issue26914] Fix formatting of lists in PEP 420

[Roundup Robot]

Roundup Robot added the comment:

New changeset d420d6fe349f by Georg Brandl in branch 'default':
Fix lists-in-blockquotes in 3xxx PEPs. Ref: #26914
https://hg.python.org/peps/rev/d420d6fe349f

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