plpython: Adjust docs after removal of Python 2 support.

Andres Freund <andres@anarazel.de>

Commit: 4228cabb72bb57e1df4c9d92613f1fcd4baadd5a
Author: Andres Freund <andres@anarazel.de>
Date: 2022-03-08T02:30:57Z
Releases: 15.0
plpython: Adjust docs after removal of Python 2 support.

Reviewed-By: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/20211031184548.g4sxfe47n2kyi55r@alap3.anarazel.de

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