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

Closes #1994

docs/angular.io-package/templates/function.template.html

@@ -1,3 +1,4 @@
+{% include "lib/githubLinks.html" -%}
 {% include "lib/paramList.html" -%}
 {% extends 'layout/base.template.html' -%}
 
@@ -13,7 +14,7 @@
 
   p.location-badge.
     exported from {@link {$ doc.moduleDoc.id $} {$doc.moduleDoc.id $} }
-    defined in <a href="https://github.com/angular/angular/tree/master/modules/{$ doc.fileInfo.relativePath $}#L{$ doc.location.start.line+1 $}-L{$ doc.location.end.line+1 $}">{$ doc.fileInfo.relativePath $} (line {$ doc.location.start.line+1 $})</a>
+    defined in {$ githubViewLink(doc) $}
 
   :markdown
 {$ doc.description | indent(4, true) $}