Added a note about the new itertools module. (Omission noted by

Gerrit Holl in email to python-docs.)

Doc/whatsnew/whatsnew23.tex

@@ -1357,6 +1357,10 @@ sequence type.  For example:
 \item The \module{imaplib} module now supports IMAP over SSL.
 (Contributed by Piers Lauder and Tino Lange.)
 
+\item The \ulink{\module{itertools}}{../lib/module-itertools.html}
+module provides several functions to support efficient looping using
+iterators.
+
 \item Two new functions in the \module{math} module,
 \function{degrees(\var{rads})} and \function{radians(\var{degs})},
 convert between radians and degrees.  Other functions in the