Added cross-references to related material on exceptions.

Closes SF bug #217195.

Doc/ref/ref6.tex

@@ -559,6 +559,9 @@ re-raise an exception transparently in an except clause, but
 exception to be re-raised was the most recently active exception in
 the current scope.
 
+Additional information on exceptions can be found in
+section~\ref{exceptions}, and information about handling exceptions is
+in section~\ref{try}.
 
 
 \section{The \keyword{break} statement \label{break}}