[3.10] gh-94635: Add Reference, How-to, and Explanation headings to sqlite3...

[3.10] gh-94635: Add Reference, How-to, and Explanation headings to sqlite3 docs (GH-94636) (#95483)

Co-authored-by: CAM Gerlach <CAM.Gerlach@Gerlach.CAM&gt;.>
(cherry picked from commit 6c439b97)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@protonmail.com>

* Fix refs