Updated FAQ

FAQ.md

@@ -1377,7 +1377,11 @@ Normally, FairEmail maintains a connection to the configured email servers whene
 If you don't want this, for example to not be disturbed or to save on battery usage, just disable synchronization in the advanced options.
 This will stop the background service which takes care of automatic synchronization and will remove the associated status bar notification.
 You can use pull-down-to-refresh in a folder or use the folder menu *Synchronize now* to manually synchronize messages.
-This will start the synchronization service for 90 seconds.
+This will start the synchronization service for 90 seconds for all configured accounts.
+
+The synchronization process will also be started to execute [operations](#user-content-faq3),
+for example to mark a message read, move a message or store a draft.
+This is to keep the local and remote message store synchronized.
 
 <br />