Issue #13491: Fix many errors in sqlite3 documentation

Initial patch by Johannes Vogel.
diff --git a/Doc/includes/sqlite3/md5func.py b/Doc/includes/sqlite3/md5func.py
index b7bc05b..0056b2d 100644
--- a/Doc/includes/sqlite3/md5func.py
+++ b/Doc/includes/sqlite3/md5func.py
@@ -7,5 +7,5 @@
 con = sqlite3.connect(":memory:")
 con.create_function("md5", 1, md5sum)
 cur = con.cursor()
-cur.execute("select md5(?)", ("foo",))
+cur.execute("select md5(?)", (b"foo",))
 print(cur.fetchone()[0])