Handle manual updates on same day correctly

- Previously manual updates to the same path on the same day were grouped together and only the last was shown, despite all being present in the content item. The grouping code was correct, but in the view only the last item was displayed.

https://govuk.zendesk.com/agent/tickets/5624376

app/views/content_items/manuals/_updates.html.erb

@@ -25,13 +25,16 @@
                 <% change_notes = updated_documents.last %>
                 <div class="govuk-!-margin-top-3">
                   <% change_notes.each do |change_note_entry| %>
+                    <% change_note_items = change_note_entry.last.collect { |i| i["change_note"] } %>
                     <% change_note = change_note_entry.flatten.last %>
                     <% if change_note["title"].present? %>
                       <p class="govuk-body">
                         <%= link_to change_note["title"], change_note["base_path"], class: "govuk-link" %>
                       </p>
                     <% end %>
-                    <%= simple_format(change_note["change_note"], class: "govuk-body") %>
+                    <% change_note_items.each do |change_note_item| %>
+                      <%= simple_format(change_note_item, class: "govuk-body") %>
+                    <% end %>
                   <% end %>
                 </div>
               <% end