Remove example personalisation from template page

This was of dubious value, and the syntax probably isn’t accurate for
all languages.

app/templates/views/send-from-api.html

@@ -32,9 +32,4 @@
     {{ api_key(template.id, name="Template ID", thing='template ID') }}
   </div>
 
-  {% if personalisation %}
-    <h2 class="heading-small">Personalisation (all fields are required)</h2>
-    {{ personalisation|syntax_highlight_json }}
-  {% endif %}
-
 {% endblock %}