gh-95273: Condense sqlite3 executescript example (#95383)

Doc/includes/sqlite3/executescript.py

-import sqlite3
-
-con = sqlite3.connect(":memory:")
-cur = con.cursor()
-cur.executescript("""
-    create table person(
-        firstname,
-        lastname,
-        age
-    );
-
-    create table book(
-        title,
-        author,
-        published
-    );
-
-    insert into book(title, author, published)
-    values (
-        'Dirk Gently''s Holistic Detective Agency',
-        'Douglas Adams',
-        1987
-    );
-    """)
-con.close()

Doc/library/sqlite3.rst

@@ -1007,9 +1007,16 @@ Cursor Objects
 
       *sql_script* must be a :class:`string <str>`.
 
-      Example:
+      Example::
 
-      .. literalinclude:: ../includes/sqlite3/executescript.py
+         # cur is an sqlite3.Cursor object
+         cur.executescript("""
+             begin;
+             create table person(firstname, lastname, age);
+             create table book(title, author, published);
+             create table publisher(name, address);
+             commit;
+         """)
 
 
    .. method:: fetchone()