update migrate script problem

Author: christophdb

docs/upgrade/extra-upgrade-notice.md

@@ -39,7 +39,7 @@ Of course, you can skip this script and make the changes manually. The following
 
     === "Script (easy way)"
 
-        Execute the migration script below; **you only need to run it once**, otherwise it will migrate your comments twice.
+        Execute the migration script below; **you only need to run it once**.
 
         ```bash
         bash /opt/seatable-compose/migrate/migrate_5.2_5.3.sh
@@ -86,7 +86,7 @@ Of course, you can skip this script and make the changes manually. The following
 ??? info "Migration of comments"
 
     Before 5.3, comments in the base and universal app were handled separately. With 5.3, these comments are merged. 
-    After starting the SeaTable container, you need to run this command once to migrate the comments.
+    After starting the SeaTable container, you need to run this command *once* to migrate the comments. Don't re-execute it, otherwise your comments will be merged twice.
 
     ```bash
     docker exec -it seatable-server bash