Cleaning up current tick.

Closes modelica#3458

chapters/statemachines.tex

@@ -32,7 +32,7 @@ \chapter{State Machines}\label{state-machines}
 \item
   Modelica blocks can be used as states.
   They might contain clocked equations.
-  If the equations are discretized, they are integrated between the previous and the next clock tick, if the corresponding state is active.
+  If the equations are discretized, they are integrated between the previous and the current clock tick, if the corresponding state is active.
 \end{itemize}
 
 \section{Transitions}\label{transitions}