chore(doc-gen): improve version dropdown info

docs/app/src/versions.js

@@ -8,6 +8,10 @@ angular.module('versions', [])
 
   for (var i = 0, minor = NaN; i < NG_VERSIONS.length; i++) {
     var version = NG_VERSIONS[i];
+    if (version.isSnapshot) {
+      version.isLatest = true;
+      continue;
+    }
     // NaN will give false here
     if (minor <= version.minor) {
       continue;

docs/config/templates/indexPage.template.html

@@ -166,7 +166,7 @@ <h4 class="search-results-group-heading">{{ key }}</h4>
         <div class="container main-grid main-header-grid">
           <div class="grid-left">
             <div ng-controller="DocsVersionsCtrl" class="picker version-picker">
-              <select ng-options="v as ('v' + v.version + (v.isSnapshot ? ' (snapshot)' : '')) group by getGroupName(v) for v in docs_versions"
+              <select ng-options="v as (v.isSnapshot ? v.branch : ('v' + v.version)) group by getGroupName(v) for v in docs_versions"
                       ng-model="docs_version"
                       ng-change="jumpToDocsVersion(docs_version)"
                       class="docs-version-jump">