Auto-update-addons is now false by default

Since auto-update-addons is false by default the
offline instructions can be simplified

doc/user/application_security/dast/index.md

@@ -517,13 +517,8 @@ For details on saving and transporting Docker images as a file, see Docker's doc
 
    dast:
      image: registry.example.com/namespace/dast:latest
-     script:
-        - export DAST_WEBSITE=${DAST_WEBSITE:-$(cat environment_url.txt)}
-        - /analyze -t $DAST_WEBSITE --auto-update-addons false
    ```
 
-The option `--auto-update-addons false` instructs ZAP not to update add-ons.
-
 ## Reports
 
 The DAST job can emit various reports.