* Doc/tut.tex (subsection{Lambda Forms}): fix typo in lambda

	example

Doc/tut.tex

@@ -2864,7 +2864,7 @@ overcome through the judicious use of default argument values, e.g.
 
 \begin{verbatim}
         def make_incrementor(n):
-                return lambda(x, incr=n): x+incr
+                return lambda x, incr=n: x+incr
 \end{verbatim}
 
 \subsection{Map, Reduce and Filter}

Doc/tut/tut.tex

@@ -2864,7 +2864,7 @@ overcome through the judicious use of default argument values, e.g.
 
 \begin{verbatim}
         def make_incrementor(n):
-                return lambda(x, incr=n): x+incr
+                return lambda x, incr=n: x+incr
 \end{verbatim}
 
 \subsection{Map, Reduce and Filter}