Fixes review notes

src/Umbraco.Web/UmbracoHelper.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
@@ -12,6 +12,7 @@ using Umbraco.Core.Xml;
 using Umbraco.Web.Mvc;
 using Microsoft.Extensions.Logging;
 using Umbraco.Web.Security;
+using System.Threading.Tasks;
 
 namespace Umbraco.Web
 {
@@ -104,13 +105,10 @@ namespace Umbraco.Web
         /// <summary>
         /// Renders the template for the specified pageId and an optional altTemplateId
         /// </summary>
-        /// <param name="contentId"></param>
+        /// <param name="contentId">The content id</param>
         /// <param name="altTemplateId">If not specified, will use the template assigned to the node</param>
-        /// <returns></returns>
-        public IHtmlEncodedString RenderTemplate(int contentId, int? altTemplateId = null)
-        {
-            return _componentRenderer.RenderTemplate(contentId, altTemplateId);
-        }
+        public async Task<IHtmlEncodedString> RenderTemplateAsync(int contentId, int? altTemplateId = null)
+            => await _componentRenderer.RenderTemplateAsync(contentId, altTemplateId);
 
         #region RenderMacro