[docs] minor documentation bug in random

Hi there, I think I may have found a minor documentation bug (really, typo) in the documentation for Random. See: http://docs.python.org/library/random.html#random.setstate I believe it should read: "state should have been obtained from a previous call to getstate(), and setstate() restores the internal state of the generator to what it was at the time **getstate()** was called." Apologies if the mistake is in my understanding rather than the documentation. :) Shaddi