update veto rules (#169)

rules/app_competition_rules.tex

@@ -117,7 +117,7 @@ \subsection{Referee Selection and Requirements}
 Referees and the GameController should be selected among the more senior members of a team, and preferably have prior experience with games in the RoboCup Standard Platform league.
 
 In each game, each of the teams playing shall be able to veto one and only one eligible referee with no reason required.
-The veto must be delivered before the start of the \texttt{ready} phase or during a stoppage of play.
+The veto must be delivered before the start of the \texttt{standby} phase or during a timeout.
 
 \subsection{Rules for Forfeiting}
 \label{sec:forfeit}