Apply suggestions from code review

Co-authored-by: Bjarke Berg <mail@bergmania.dk>

src/Umbraco.Web.Common/Extensions/EndpointRouteBuilderExtensions.cs

@@ -37,7 +37,7 @@ namespace Umbraco.Web.Common.Extensions
                 pattern.Append('/').Append(controllerName);
             }
 
-            pattern.Append('/').Append("{action}/{id?}");
+            pattern.Append("/{action}/{id?}");
 
             var defaults = defaultAction.IsNullOrWhiteSpace()
                 ? (object)new { controller = controllerName }

src/Umbraco.Web.Common/ModelBinders/ContentModelBinder.cs

@@ -31,7 +31,7 @@ namespace Umbraco.Web.Common.ModelBinders
             // in the aspnet pipeline it will really only support converting from IPublishedContent which is contained
             // in the UmbracoRouteValues --> IContentModel
             UmbracoRouteValues umbracoRouteValues = bindingContext.HttpContext.Features.Get<UmbracoRouteValues>();
-            if (umbracoRouteValues == null)
+            if (umbracoRouteValues is null)
             {
                 return Task.CompletedTask;
             }

src/Umbraco.Web.Website/Controllers/SurfaceController.cs

@@ -41,7 +41,7 @@ namespace Umbraco.Web.Website.Controllers
             get
             {
                 UmbracoRouteValues umbracoRouteValues = HttpContext.Features.Get<UmbracoRouteValues>();
-                if (umbracoRouteValues == null)
+                if (umbracoRouteValues is null)
                 {
                     throw new InvalidOperationException($"No {nameof(UmbracoRouteValues)} feature was found in the HttpContext");
                 }