Note missing explanation

Doc/whatsnew/whatsnew21.tex

@@ -15,7 +15,7 @@
 
 {\large This document is a draft, and is subject to change until
 the final version of Python 2.1 is released.  Currently it is up to date
-for Python 2.1 beta 1.  Please send any comments, bug reports, or
+for Python 2.1 beta 2.  Please send any comments, bug reports, or
 questions, no matter how minor, to \email{amk1@bigfoot.com}.  }
 
 It's that time again... time for a new Python release, version 2.1.
@@ -799,7 +799,7 @@ summary for January 1-15, 2001.
 
 \item A new method, \method{popitem()}, was added to dictionaries to
 enable destructively iterating through the contents of a dictionary;
-this can be faster for large dictionaries because .
+this can be faster for large dictionaries because XXX.
 \code{D.popitem()} removes a random \code{(\var{key}, \var{value})}
 pair from the dictionary and returns it as a 2-tuple.  This was
 implemented mostly by Tim Peters and Guido van Rossum, after a