Work around the conversion of ">>" and "<<" to guillemets.  Reported by
Ping on the Doc-SIG mailing list.
diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex
index 810fb1a..5663daa 100644
--- a/Doc/ref/ref5.tex
+++ b/Doc/ref/ref5.tex
@@ -931,7 +931,7 @@
   \hline
     \lineii{\code{\&}}				{Bitwise AND}
   \hline
-    \lineii{\code{<<}, \code{>>}}		{Shifts}
+    \lineii{\code{<}\code{<}, \code{>}\code{>}}	{Shifts}
   \hline
     \lineii{\code{+}, \code{-}}{Addition and subtraction}
   \hline