gh-96168: Improve sqlite3 dict_factory example (GH-96457)

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
(cherry picked from commit 91f40f3f)

Co-authored-by: Erlend E. Aasland <erlend.aasland@innova.no>