fix(api-builder): remove line number from the github source link

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Author: IgorMinar

tools/api-builder/angular.io-package/templates/lib/githubLinks.html

@@ -3,5 +3,5 @@
 {%- endmacro %}
 
 {% macro githubViewLink(doc) -%}
-  <a href="{$ githubHref(doc) $}">{$ doc.fileInfo.projectRelativePath $} (line {$ doc.location.start.line+1 $})</a>
-{%- endmacro %}
+  <a href="{$ githubHref(doc) $}">{$ doc.fileInfo.projectRelativePath $}</a>
+{%- endmacro %}