Be clearer about the templates needed to go live

Adding a ‘testing’ template it not enough. It needs to have some real
looking content, so that we can:
- work out what a service is doing
- assess whether that’s a reasonable (ie meeting the terms of use) thing
  to be doing with Notify

At the moment we’re having to go back to services quite a lot when they
request to go live and ask them for this stuff.

app/templates/views/service-settings/request-to-go-live.html

@@ -26,7 +26,7 @@
         ) }}
         {{ tick_cross_done_not_done(
           has_templates,
-          'Create some <a href="{}">templates</a>'.format(
+          'Create <a href="{}">templates</a> showing the kind of messages you plan to send'.format(
             url_for('main.choose_template', service_id=current_service.id)
           )|safe,
         ) }}