gh-94017: Improve clarity of sqlite3 transaction handling docs (GH-94320)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: CAM Gerlach <CAM.Gerlach@Gerlach.CAM>
(cherry picked from commit 760b8cf0c887fbc5191611a7e7d4b8c0c4f15edc)

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