added description for nloc parameter in usage message

src/TestNloc.java

@@ -28,7 +28,7 @@ public class TestNloc {
       System.out.println("Values for mode: exhaustive, random, onlydefault");
       System.out.println("Deafult: exhaustive");
       System.out.println("");
-      System.out.println("nloc");
+      System.out.println("nloc <network>");
       System.out.println("Values for nloc: S1, S2, S3, S4, S5");
       System.out.println("No default. Mandatory input!");
       System.out.println("");