Update to use the notice environment so a multi-paragraph note can be

appropriately marked.

Doc/ref/ref6.tex

@@ -482,14 +482,16 @@ difficulty is that there's no guarantee the generator will ever be
 resumed, hence no guarantee that the \keyword{finally} block will ever
 get executed.
 
-\note{In Python 2.2, the \keyword{yield} statement is only allowed
+\begin{notice}
+In Python 2.2, the \keyword{yield} statement is only allowed
 when the \code{generators} feature has been enabled.  It will always
 be enabled in Python 2.3.  This \code{__future__} import statment can
-be used to enable the feature:}
+be used to enable the feature:
 
 \begin{verbatim}
 from __future__ import generators
 \end{verbatim}
+\end{notice}
 
 
 \begin{seealso}