Fix a few grammar problems in the documentation and comments
diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index ecc5507..5efdb67 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -3019,7 +3019,7 @@
'''Test extremely small number of columns.
TestCase prevents "COLUMNS" from being too small in the tests themselves,
- but we don't want any exceptions thrown in such case. Only ugly representation.
+ but we don't want any exceptions thrown in such cases. Only ugly representation.
'''
def setUp(self):
env = support.EnvironmentVarGuard()