Remove text from travel advice callout box

This is in line with latest guidance from DfT

Author: JonathanHallam

app/views/content_items/travel_advice.html.erb

@@ -27,7 +27,7 @@
       <div class="travel-advice-notice__content">
         <p class="govuk-body">
           <strong>
-            Under current UK COVID-19 restrictions, you must stay at home. It is illegal to travel abroad for holidays or leisure purposes.
+            Under current UK COVID-19 restrictions, you must stay at home. It is illegal to travel abroad for holidays.
           </strong>
           Check the <a href="/guidance/national-lockdown-stay-at-home">rules in England</a>, <a href="https://www.gov.scot/coronavirus-covid-19/">Scotland</a>, <a href="https://gov.wales/covid-19-alert-levels">Wales</a> and <a href="https://www.nidirect.gov.uk/articles/coronavirus-covid-19-regulations-guidance-what-restrictions-mean-you">Northern Ireland</a>.
         </p>