Update MultiTableOverlappingVerifier.java

dmn-verifier-app/src/main/java/de/unikoblenz/fgbks/dmn/core/verifier/multitable/MultiTableOverlappingVerifier.java

@@ -39,7 +39,7 @@ public class MultiTableOverlappingVerifier extends OverlappingVerifier {
             .collect(Collectors.joining(", ")));
     sb.append(" are overlapping.");
     if (isDifferentConclusion) {
-      sb.append(" The output has different conclusions!");
+      sb.append(" The outputs have different conclusions!");
     } else {
       sb.append(" The output is the same.");
     }