Add some documentation

dmnverifierapi/src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/AbstractVerifier.java

@@ -27,14 +27,16 @@ public abstract class AbstractVerifier implements Verifier {
   protected VerificationType verificationType;
   protected AbstractDmnVerifierConfig verifierConfig;
   protected VerifierResult.Builder resultBuilder;
+  /**
+   * The {@link VerificationResultEntryFactory} for adding result entries.
+   */
   protected VerificationResultEntryFactory vreFactory;
+
   protected DmnObjectContainer dmnObjectContainer;
 
   private long executionTime = -1;
 
-  /**
-   * {@inheritDoc}
-   */
+  /** {@inheritDoc} */
   @Override
   public VerificationType getVerificationType() {
     return verificationType;
@@ -101,7 +103,7 @@ public abstract class AbstractVerifier implements Verifier {
 
   /**
    * This method must be implemented by the finial verifiers and should contain the calculation of
-   * the verifier.
+   * the verifier. The {@link AbstractVerifier#vreFactory} can be used for adding result entries.
    */
   protected abstract void doVerification();