clarify the docs and new warning message.
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 949c30a..0b33157 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -623,8 +623,8 @@
# Notification for http://bugs.python.org/issue7213 & issue2320
warnings.warn(
'The close_fds parameter was not specified. Its default'
- ' will change from False to True in a future Python'
- ' version. Most users should set it to True. Please'
+ ' behavior will change in a future Python version. '
+ ' Most users should set it to True. Please'
' update your code explicitly set close_fds.',
DeprecationWarning)