removed a stray dollar sign

doc/manual.tex

@@ -1133,7 +1133,7 @@ A quick test of one of the pricing functions is afforded by the
 following command.\begin{verbatim}
 $ fun flo crt --main="amer(crr&,max/0.+ minus\100.)" --cast
 1.104387e+01
-\end{verbatim}\$
+\end{verbatim}%$
 The payoff function used in this case would be expressed as
 $
 f(s) = \max(0,s - 100)