Fix links to documentation.

templates/front/details.html

@@ -84,10 +84,10 @@
                 <code>{{ check.email }}</code>
 
                 <p>You can also explicitly
-                    <a href="{% url 'hc-docs' %}#fail-event">
+                    <a href="{% url 'hc-serve-doc' 'signalling_failures' %}">
                         signal a failure</a>
                     and
-                    <a href="{% url 'hc-docs' %}#start-event">
+                    <a href="{% url 'hc-serve-doc' 'measuring_script_run_time' %}">
                         measure job execution time</a>.
                 </p>
             </div>