fixed SQLite3::setAuthorizer parameter order description. (#593)

5th and 6th parameter description is wrong, because they are copy-and-pasted from the following C interface manual page.

https://www.sqlite.org/c3ref/c_alter_table.html

Author: mumumu

reference/sqlite3/sqlite3/setauthorizer.xml

@@ -82,11 +82,11 @@
    </table>
   </para>
   <para>
-   The 5th parameter will be the name of the database (<literal>"main"</literal>,
+   The 4th parameter will be the name of the database (<literal>"main"</literal>,
    <literal>"temp"</literal>, etc.) if applicable.
   </para>
   <para>
-   The 6th parameter to the authorizer callback is the name of the inner-most trigger or
+   The 5th parameter to the authorizer callback is the name of the inner-most trigger or
    view that is responsible for the access attempt or &null; if this access attempt is
    directly from top-level SQL code.
   </para>