Update T4.tex

Tutorials/T04-A2Example/slides/T4.tex

@@ -333,7 +333,7 @@ From the MIS we can deduce the interface of the code will look like:
 
 	\begin{lstlisting}
 	# Interface
-	class pointT:
+	class PointT:
 	
 	    # Constructor
 	    def __init__(self, x, y):