chore(doc-gen): improve github links to point to the correct tagged URL

Closes #1994

docs/dgeni-package/templates/function.template.html

@@ -1,9 +1,11 @@
 {% include "lib/paramList.html" -%}
+{% include "lib/githubLinks.html" -%}
 {% extends 'layout/base.template.html' -%}
 
 {% block body %}
 <h1 class="function export">{$ doc.name $}{$ paramList(doc.parameters) $}</h1>
-<p class="module">exported from {@link {$ doc.moduleDoc.id $} {$doc.moduleDoc.id $} }</p>
+<p class="module">exported from {@link {$ doc.moduleDoc.id $} {$doc.moduleDoc.id $} }<br/>
+defined in {$ githubViewLink(doc) $}</p>
 <p>{$ doc.description | marked $}</p>
 
 {% endblock %}