message: update changeset to document how to keep the existing behavior
diff: @@ -11,3 +11,11 @@ backend:
  csp:
  - upgrade-insecure-requests: false
  ```
  +
  +But if you want to keep the existing behavior of `upgrade-insecure-requests` Content-Security-Policy being enabled, make the following change in your `app-config.yaml`. You can read more the CSP here https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/upgrade-insecure-requests
  +
  +```diff
  +backend:
  ++ csp:
  ++ upgrade-insecure-requests: []
  +```
  