Make example date depend on collection year (#2620)

app/views/merge_requests/merge_date.html.erb

@@ -11,7 +11,7 @@
       <h2 class="govuk-heading-l">What is the merge date?</h2>
       <p class="govuk-hint">
         Enter the official merge date. Log and organisation page data will show the new organisation name from this date. <br><br>
-        For example, 13 9 2024</p>
+        For example, <%= date_mid_collection_year_formatted(Time.zone.now) %></p>
       <%= f.govuk_date_field :merge_date,
         legend: { hidden: true },
         width: 20 do %>