Documentation updates for issues 8302 and 8351 (truncating excessive diffs in unittest failure messages and reporting SkipTest exceptions in setUpClass and setUpModule as skips rather than errors).
Documentation updates for issues 8302 and 8351 (truncating excessive diffs in unittest failure messages and reporting SkipTest exceptions in setUpClass and setUpModule as skips rather than errors).

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator