Merge pull request pypa#6933 from pradyunsg/misc/warning-cleanup

Move docstring to appropriately placed comment

tests/functional/test_warning.py

@@ -2,7 +2,6 @@
 
 
 def test_environ(script, tmpdir):
-    """$PYTHONWARNINGS was added in python2.7"""
     demo = tmpdir.joinpath('warnings_demo.py')
     demo.write_text(textwrap.dedent('''
         from logging import basicConfig
@@ -18,6 +17,7 @@ def test_environ(script, tmpdir):
     expected = 'WARNING:pip._internal.deprecations:DEPRECATION: deprecated!\n'
     assert result.stderr == expected
 
+    # $PYTHONWARNINGS was added in python2.7
     script.environ['PYTHONWARNINGS'] = 'ignore'
     result = script.run('python', demo)
     assert result.stderr == ''