fix testdocs.py failures - now expects tuples rather than lists

/doc/build/testdocs.py fails as a result of:

http://www.sqlalchemy.org/trac/changeset/6860

http://www.sqlalchemy.org/trac/changeset/6861

(mydevenv)[build](diana@devimage)$ python testdocs.py
...
***Test Failed*** 46 failures.

For example:

**********************************************************************
File "sqlexpression.rst", line 1092, in sqlexpression.rst
Failed example:
    conn.execute(users.delete().where(users.c.name > 'm')) #doctest: +ELLIPSIS
Expected:
    DELETE FROM users WHERE users.name > ?
    ['m']('m')
    COMMIT
    <sqlalchemy.engine.base.ResultProxy object at 0x...>
Got:
    DELETE FROM users WHERE users.name > ?
    ('m',)
    COMMIT
    <sqlalchemy.engine.base.ResultProxy object at 0x9ba5b4c>
**********************************************************************

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