Update 0.FAQ.md (#825)

add note that meta services can be migrated

Author: abby-cyber

docs-2.0/20.appendix/0.FAQ.md

@@ -297,6 +297,10 @@ Nebula Graph {{ nebula.release }} does not provide any commands or tools to supp
 
 1. Scale out and scale in metad: The metad process can not be scaled out or scale in. The process cannot be moved to a new machine. You cannot add a new metad process to the service.
 
+  !!! note
+
+         You can use the [Meta transfer script tool](https://github.com/vesoft-inc/nebula/blob/master/scripts/meta-transfer-tools.sh) to migrate Meta services. Note that the Meta-related settings in the configuration files of Storage and Graph services need to be modified correspondingly.
+
 2. Scale in graphd: Remove the IP of the graphd process from the code in the client. Close this graphd process.
 
 3. Scale out graphd: Prepare the binary and config files of the graphd process in the new host. Modify the config files and add all existing addresses of the metad processes. Then start the new graphd process.