Update the marine_notice model spec
Update the marine_notice model spec

I changed the content schema to allow multiple options in https://github.com/alphagov/govuk-content-schemas/pull/984

I now want to remove the `string` option in the schema as per https://github.com/alphagov/govuk-content-schemas/pull/985
but I need to update this spec first.

alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher,alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild