[3.11] gh-48241: Clarify URL needs to be encoded when provided to urlopen and Request (GH-103855) (#103891) (cherry picked from commit 44010d0f1203134cd8f885ca574caaef373e80f6) Co-authored-by: Michael Blahay <mblahay@users.noreply.github.com> Co-authored-by: Ćukasz Langa <lukasz@langa.pl>