docs: update truenas migration section to include chown (#3143)

Author: thraizz

docs/migration-guide.mdx

@@ -267,7 +267,7 @@ For detailed community-maintained TrueNAS SCALE walkthroughs, see the [Host Path
     3. Copy ixVolume Data
           Open System Settings → Shell, or SSH into your TrueNAS server as root and run :
           ```bash
-          rsync -av /mnt/.ix-apps/app_mounts/jellyseerr/ /mnt/storage/seerr/
+          rsync -av --chown=568:568 /mnt/.ix-apps/app_mounts/jellyseerr/ /mnt/storage/seerr/
           ```
     4. Install Seerr and use the same Host Path storage that was created before (`/mnt/storage/seerr/config` in our example)
     5. Start Seerr app