DOC: reset table_schema option after example
@jreback I think this should fix the errors you noticed here https://github.com/pandas-dev/pandas/issues/15559#issuecomment-284166380 (let's see if travis agrees with me)

The table schema repr was activated due to the example (the ipython environment lives on between different documents; it would actually be a good idea to completely reset them for each rst file)

cc @TomAugspurger in any case an example that it's not yet ready to be default on True :-) 