Minor edit to L23 on finite state machines

Lectures/L23_FiniteStateMachines/FiniteStateMachines.tex

@@ -77,6 +77,8 @@ TBD
 \bi
 \item LineT len output type better as $\mathbb{N}$ (rather than $\mathbb{Z}$)
 \item LineT strt output should be $out := \mbox{PointT}(s.x(), s.y())$
+\item PathT len output the total number of points (grid cells) on the path,
+    including the beginning and end points (cells).
 \ei
 \end{itemize}