Doc: fix a typo in an exemple

lv6-ref-man/lv6-ref-man.tex

@@ -866,7 +866,7 @@ the behavior of the whole program is unpredictable.
 
 \begin{example}[Extern Nodes]
 \begin{alltt} 
-\kwd{extern} \kwd{node} foo\_with\_mem(A:int, B:bool, C: real) \kwd{returns} (X:int, Y: real);
+\kwd{extern} \kwd{node} foo\_with\_mem(A:int; B:bool, C: real) \kwd{returns} (X:int; Y: real);
 \kwd{extern} \kwd{function} sin(A:real) \kwd{returns} (sinx: real);
 \end{alltt}