Add comments about account sync restrictions

bubble-server/src/main/java/bubble/service/account/StandardSyncAccountService.java

@@ -56,6 +56,11 @@ public class StandardSyncAccountService implements SyncAccountService {
         if (installType == AnsibleInstallType.sage) {
             // changing account on sage, notify all bubbles launched by user that have syncAccount == true
 
+            // sync account: sage -> node(s)
+            // Note that a non-admin person can change only his own account on sage node, while admin can change any
+            // account. In both cases, the change should be synced through the nodes, so even for non-admin account, the
+            // sync should be done here.
+
             for (BubbleNetwork network : networkDAO.findByAccount(account.getUuid())) {
                 if (network.getState() != BubbleNetworkState.running) continue;
                 if (!network.syncAccount()) continue;
@@ -70,6 +75,11 @@ public class StandardSyncAccountService implements SyncAccountService {
             }
 
         } else if (installType == AnsibleInstallType.node) {
+            // sync account: node -> sage
+            // On sage there's just a single account related to this node - the node's network owner's account. So only
+            // that account should be synced in this case. It doesn't matter if somebody already changed this account
+            // to be non-admin (TODO strange situation and maybe it should be tested if it is forbidden already)
+
             if (account.getUuid().equals(thisNetwork.getAccount())) {
                 log.info("sync: not syncing non-owner account from node to sage");
                 return;