Removed old issue numbers. Further documentation

hawkbit-repository/src/main/java/org/eclipse/hawkbit/repository/DeploymentManagement.java

@@ -365,7 +365,7 @@ public class DeploymentManagement {
         }).collect(Collectors.toList())).stream()
                 .collect(Collectors.toMap(a -> a.getTarget().getControllerId(), Function.identity()));
 
-        // MECS-720 create initial action status when action is created so we
+        // create initial action status when action is created so we
         // remember the initial
         // running status because we will change the status of the action itself
         // and with this action

hawkbit-repository/src/main/java/org/eclipse/hawkbit/repository/DistributionSetManagement.java

@@ -294,8 +294,7 @@ public class DistributionSetManagement {
         // hard delete the rest if exixts
         if (!toHardDelete.isEmpty()) {
             // don't give the delete statement an empty list, JPA/Oracle cannot
-            // handle the empty list,
-            // see MECS-403
+            // handle the empty list
             distributionSetRepository.deleteByIdIn(toHardDelete);
         }
     }

hawkbit-repository/src/main/java/org/eclipse/hawkbit/repository/SystemManagement.java

@@ -280,7 +280,7 @@ public class SystemManagement implements EnvironmentAware {
      * @return {@code true} in case the tenant exits or {@code false} if not
      */
     @Cacheable(value = "currentTenant", keyGenerator = "currentTenantKeyGenerator")
-    // MECS-903 set transaction to not supported, due we call this in
+    // set transaction to not supported, due we call this in
     // BaseEntity#prePersist methods
     // and it seems that JPA committing the transaction when executing this
     // transactional method,