JavaDoc and performance

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

hawkbit-repository/hawkbit-repository-jpa/src/main/java/org/eclipse/hawkbit/repository/jpa/model/JpaDistributionSet.java

@@ -158,6 +158,7 @@ public class JpaDistributionSet extends AbstractJpaNamedVersionedEntity implemen
         return Collections.unmodifiableSet(tags);
     }
 
+    @Override
     public boolean addTag(final DistributionSetTag tag) {
         if (tags == null) {
             tags = new HashSet<>();
@@ -166,6 +167,7 @@ public class JpaDistributionSet extends AbstractJpaNamedVersionedEntity implemen
         return tags.add(tag);
     }
 
+    @Override
     public boolean removeTag(final DistributionSetTag tag) {
         if (tags == null) {
             return false;