fix typo

Doc/whatsnew/whatsnew25.tex

@@ -1583,7 +1583,7 @@ using the mode \code{'r|*'}.
 \item The \module{unicodedata} module has been updated to use version 4.1.0
 of the Unicode character database.  Version 3.2.0 is required 
 by some specifications, so it's still available as 
-\member{unicodedata.db_3_2_0}.
+\member{unicodedata.ucd_3_2_0}.
 
 \item The \module{webbrowser} module received a number of
 enhancements.