gh-96397: Document that attributes need not be identifiers (GH-96454) Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM> (cherry picked from commit 9a11ed8e50492d327e4de0a8f3a473e788b14a6f) Co-authored-by: Jeff Allen <ja.py@farowl.co.uk>