CLDC-2862: update content on maintenance page

app/views/maintenance/service_unavailable.html.erb

@@ -4,8 +4,8 @@
 
 <div class="govuk-grid-row">
   <div class="govuk-grid-column-two-thirds-from-desktop">
-    <p class="govuk-body">You will be able to use the service later from TIME on DAY.</p>
-    <p class="govuk-body">We saved your answers.</p>
+    <p class="govuk-body">You will be able to use the service from 9am on Thursday 16 November 2023.</p>
+    <p class="govuk-body">Changes from the page you were on have not been saved. Changes on pages where you have selected 'save and continue' have been saved.</p>
     <p class="govuk-body"><%= govuk_link_to "Contact the helpdesk", "https://dluhcdigital.atlassian.net/servicedesk/customer/portal/6/group/11" %> if you need assistance in the meantime.</p>
   </div>
 </div>