Add missing \end, noted by George Yoshida
diff --git a/Doc/whatsnew/whatsnew25.tex b/Doc/whatsnew/whatsnew25.tex
index 74cbf76..dac87b4 100644
--- a/Doc/whatsnew/whatsnew25.tex
+++ b/Doc/whatsnew/whatsnew25.tex
@@ -194,6 +194,7 @@
   File ``t.py'', line 15, in ?
     print it.next()
 StopIteration
+\end{verbatim}
 
 Because \keyword{yield} will often be returning \constant{None}, 
 you shouldn't just use its value in expressions unless you're sure