Use token correctly and add master branch.

modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml.cs

@@ -42,7 +42,10 @@ namespace Volo.Docs.Pages.Documents.Project
         private readonly IDocumentConverterFactory _documentConverterFactory;
         private readonly IProjectAppService _projectAppService;
 
-        public IndexModel(IDocumentAppService documentAppService, IDocumentConverterFactory documentConverterFactory, IProjectAppService projectAppService)
+        public IndexModel(
+            IDocumentAppService documentAppService, 
+            IDocumentConverterFactory documentConverterFactory, 
+            IProjectAppService projectAppService)
         {
             _documentAppService = documentAppService;
             _documentConverterFactory = documentConverterFactory;
@@ -88,6 +91,8 @@ namespace Volo.Docs.Pages.Documents.Project
                     project.DocumentStoreType, DocumentNameWithExtension))
                     .Select(v => new VersionInfo(v, v)).ToList();
 
+            Versions.Insert(0, new VersionInfo("master","master"));
+
             LatestVersionInfo = GetLatestVersion();
 
             if (string.Equals(Version, DocsAppConsts.LatestVersion, StringComparison.OrdinalIgnoreCase))