Update OverlappingVerifier.java

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

@@ -147,14 +147,14 @@ public class OverlappingVerifier extends AbstractVerifier {
     StringBuilder sb = new StringBuilder();
     sb.append("In table ");
     sb.append(currentRuleIdentifiers.get(0).getTableName());
-    sb.append(" rules ");
+    sb.append(", rules ");
     sb.append(
         currentRuleIdentifiers.stream()
             .map(c -> c.getRowNumber().toString())
             .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.");
     }