[docs] [issue18573] In unittest.TestCase.assertWarns doc there is some text about assertRaises()

Changes by Terry J. Reedy <tjreedy@udel.edu>: ---------- assignee: docs@python -> terry.reedy nosy: +terry.reedy _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18573> _______________________________________