Update request a TRN content

The process has changed. Link to the guidance.

app/views/pages/you_dont_have_a_trn.html.erb

@@ -8,7 +8,7 @@
     <h2 class="govuk-heading-l" id="how-to-get-a-trn">How to get a TRN</h2>
     <p class="govuk-body">If you’re eligible for a TRN in England, you should be allocated one automatically by the Teaching Regulation Agency or Capita Teachers’ Pensions.</p>
 
-    <p class="govuk-body">If you do not have a TRN but need one to do a national professional qualification (NPQ), you should get instructions about how to request one. If you do not receive these instructions, email <%= govuk_link_to t("service.email"), "mailto:#{t("service.email")}" %>.</p>
+    <p class="govuk-body">If you do not have a TRN but need one to do a national professional qualification (NPQ), you can <%= govuk_link_to "request a TRN", "https://www.gov.uk/guidance/teacher-reference-number-trn" %>.</p>
 
     <h2 class="govuk-heading-l" id="what-a-trn-is-for">What a TRN is for</h2>
     <p class="govuk-body">You need a TRN to:</p>