doc(simulation): add todo

Author: wenkokke

simulation/docs/sim-realism.tex

@@ -140,6 +140,7 @@ \section{Summary}
     \item \label{sc:boundedcpu} nodes simulate CPU tasks with a finite number of worker threads.
     \item \label{sc:order} request IB bodies in oldest-first order.
 \end{enumerate}
+\todo{move Scenario \ref{sc:order} out of ordered list and into a ``variants'' list}
 The last scenario is not strictly about realism, but we rather want to
 investigate the impact of deviating from the freshest-first default.