Make sure section numbers wrap together with the preceeding word

("section").

Doc/ref/ref4.tex

@@ -204,5 +204,6 @@ be relied on by code which will run under multiple versions of the
 interpreter.
 \end{notice}
 
-See also the description of the \keyword{try} statement in section
-\ref{try} and \keyword{raise} statement in section \ref{raise}.
+See also the description of the \keyword{try} statement in
+section~\ref{try} and \keyword{raise} statement in
+section~\ref{raise}.