Remove superfluous comment in urllib.error. (#1076)

diff --git a/Lib/urllib/error.py b/Lib/urllib/error.py
index c5b675d..851515b 100644
--- a/Lib/urllib/error.py
+++ b/Lib/urllib/error.py
@@ -16,10 +16,6 @@
 __all__ = ['URLError', 'HTTPError', 'ContentTooShortError']
 
 
-# do these error classes make sense?
-# make sure all of the OSError stuff is overridden.  we just want to be
-# subtypes.
-
 class URLError(OSError):
     # URLError is a sub-type of OSError, but it doesn't share any of
     # the implementation.  need to override __init__ and __str__.