add notes that multi-slit is asymmetric

RegressionTests/Slit-1/Slit-1.in

@@ -46,7 +46,7 @@ DISTRIB1: DISTRIBUTION,
 
 
 
-
+// SLIT1 is a asymmetric multi-slit where the range of the slits are -4 cm <= x <= 0.0
 SLIT1: FLEXIBLECOLLIMATOR, DESCRIPTION="repeat(translate(rectangle(0.04,0.002),-0.02,-0.02),20,0,0.004)", L=0.04, ELEMEDGE=32.432;
 MSLIT1: MONITOR, ELEMEDGE=32.472;
 

RegressionTests/Slit-2/slit.txt

-repeat(
+repeat(// this is a asymmetric multi-slit whose slits range from -4 cm <= x <= 0.0
 	translate(
 		 rectangle(
 			  0.04,0.002),
 	         -0.02,-0.02),
-      20,0,0.004)
+      20,0,0.004)
\ No newline at end of file