The third and final doc-string sweep by Ka-Ping Yee.

The attached patches update the standard library so that all modules
have docstrings beginning with one-line summaries.

A new docstring was added to formatter.  The docstring for os.py
was updated to mention nt, os2, ce in addition to posix, dos, mac.
diff --git a/Lib/types.py b/Lib/types.py
index d5f9255..2f4a8d4 100644
--- a/Lib/types.py
+++ b/Lib/types.py
@@ -1,5 +1,7 @@
-# Define names for all type symbols known in the standard interpreter.
-# Types that are part of optional modules (e.g. array) are not listed.
+"""Define names for all type symbols known in the standard interpreter.
+
+Types that are part of optional modules (e.g. array) are not listed.
+"""
 
 import sys