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

Closes #1994

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

@@ -1,11 +1,12 @@
 {% include "lib/paramList.html" -%}
+{% include "lib/githubLinks.html" -%}
 {% extends 'layout/base.template.html' -%}
 
 {% block body %}
 <h1 class="class export">{$ doc.name $} <span class="type">{$ doc.docType $}</span></h1>
 <p class="module">exported from {@link {$ doc.moduleDoc.id $} {$doc.moduleDoc.id $} }<br/>
-defined in <a href="https://github.com/angular/angular/tree/master/modules/{$ doc.fileInfo.relativePath $}#L{$ doc.location.start.line+1 $}-L{$ doc.location.end.line+1 $}">
-  {$ doc.fileInfo.relativePath $} (line {$ doc.location.start.line+1 $})</a></p>
+defined in {$ githubViewLink(doc) $}
+</p>
 <p>{$ doc.description | marked $}</p>
 
 {%- if doc.constructorDoc or doc.members.length -%}