Updates to emergency contact details

Some updates to the emergency contact details page, at the request of Elena. Also need to update the 'last_updated' value in the YML - (see Jake) in the deployment repository
* internal URLs shouldn't be hard-coded here - you can use `link_to "<link text>", new_content_change_request_path`
* it probably should be "**c**reate a content **change** request" (missing word, bulleted lists should always be lower case, according to the GOV.UK style guide)
* I think we should drop "on the internal support form" from the link, because the user already is on the internal support form (aka the GOV.UK Support form).