pythongh-94635: Add sqlite3 'Introduction' and 'Tutorial' doc headings (

pythonGH-95269)

(cherry picked from commit 2e35a13)

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

Doc/library/sqlite3.rst

@@ -8,7 +8,11 @@
 
 **Source code:** :source:`Lib/sqlite3/`
 
---------------
+
+.. _sqlite3-intro:
+
+Introduction
+------------
 
 SQLite is a C library that provides a lightweight disk-based database that
 doesn't require a separate server process and allows accessing the database
@@ -21,6 +25,12 @@ The sqlite3 module was written by Gerhard Häring.  It provides an SQL interface
 compliant with the DB-API 2.0 specification described by :pep:`249`, and
 requires SQLite 3.7.15 or newer.
 
+
+.. _sqlite3-tutorial:
+
+Tutorial
+--------
+
 To use the module, start by creating a :class:`Connection` object that
 represents the database.  Here the data will be stored in the
 :file:`example.db` file::