accumulation: better option desc

prism/src/prism/PrismSettings.java

@@ -1899,8 +1899,8 @@ public class PrismSettings implements Observer
 		mainLog.println("-fauinitival <x> ............... Set length of additional initial time interval for FAU [default: 1.0]");
 		mainLog.println();
 		mainLog.println("ACCUMULATION MODEL CHECKING OPTIONS:");
-		mainLog.println("-accforcecomplex <b> ........... Force rewriting into complex until formulae for accumulation [default: false]");
-		mainLog.println("-accgeneratedots <b> ........... Generate DOT files for accumulation automata and products [default: false]");
+		mainLog.println("-accforcecomplex ............... Force rewriting into complex until formulae for accumulation");
+		mainLog.println("-accgeneratedots ............... Generate DOT files for accumulation automata and products");
 	}
 
 	/**