Update file-sync-troubleshoot-installation.md

Updated error code 0x80C80064 for error - This server is already registered

Author: codefinite-vri

support/azure/azure-storage/files/file-sync/file-sync-troubleshoot-installation.md

@@ -174,7 +174,7 @@ This issue occurs due to a known issue that has been fixed in File Sync Agent v1
 
 :::image type="content" source="media/file-sync-troubleshoot-installation/server-already-registered-error.png" alt-text="Screenshot that shows the Server Registration dialog box with the 'server is already registered' error message.":::
 
-This message appears if the server was previously registered with a Storage Sync Service. To unregister the server from the current Storage Sync Service and then register with a new Storage Sync Service, complete the steps that are described in [Unregister a server with Azure File Sync](/azure/storage/file-sync/file-sync-server-registration#unregister-the-server-with-storage-sync-service).
+This message with error code 0x80C80064 appears if the server was previously registered with a Storage Sync Service.  To unregister the server from the current Storage Sync Service and then register with a new Storage Sync Service, complete the steps that are described in [Unregister a server with Azure File Sync](/azure/storage/file-sync/file-sync-server-registration#unregister-the-server-with-storage-sync-service).
 
 If the server isn't listed under **Registered servers** in the Storage Sync Service, on the server that you want to unregister, run the following PowerShell commands: