Include new warning in RuboCop header template
Include new warning in RuboCop header template

This is so we maintain this convention [1] in new repos.

[1]: https://github.com/alphagov/content-publisher/pull/2411

alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs