Add missing doc comments (#8035)

src/Middleware/StaticFiles/src/HtmlDirectoryFormatter.cs

@@ -9,7 +9,6 @@ using System.Text;
 using System.Text.Encodings.Web;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
-using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.FileProviders;
 
 namespace Microsoft.AspNetCore.StaticFiles
@@ -23,6 +22,10 @@ namespace Microsoft.AspNetCore.StaticFiles
 
         private HtmlEncoder _htmlEncoder;
 
+        /// <summary>
+        /// Constructs the <see cref="HtmlDirectoryFormatter"/>.
+        /// </summary>
+        /// <param name="encoder">The character encoding representation to use.</param>
         public HtmlDirectoryFormatter(HtmlEncoder encoder)
         {
             if (encoder == null)

src/Middleware/StaticFiles/src/StaticFileResponseContext.cs

@@ -12,11 +12,19 @@ namespace Microsoft.AspNetCore.StaticFiles
     /// </summary>
     public class StaticFileResponseContext
     {
+        /// <summary>
+        /// Constructs the <see cref="StaticFileResponseContext"/>.
+        /// </summary>
         [Obsolete("Use the constructor that passes in the HttpContext and IFileInfo parameters: StaticFileResponseContext(HttpContext context, IFileInfo file)", false)]
         public StaticFileResponseContext()
         {
         }
 
+        /// <summary>
+        /// Constructs the <see cref="StaticFileResponseContext"/>.
+        /// </summary>
+        /// <param name="context">The request and response information.</param>
+        /// <param name="file">The file to be served.</param>
         public StaticFileResponseContext(HttpContext context, IFileInfo file)
         {
             if (file == null)

src/Mvc/Mvc.Abstractions/src/Abstractions/ActionDescriptor.cs

@@ -10,7 +10,7 @@ using Microsoft.AspNetCore.Mvc.Routing;
 namespace Microsoft.AspNetCore.Mvc.Abstractions
 {
     /// <summary>
-    /// Describes a MVC action.
+    /// Describes an MVC action.
     /// </summary>
     public class ActionDescriptor
     {

src/Mvc/Mvc.Core/src/ApplicationModels/ControllerModel.cs

@@ -68,6 +68,9 @@ namespace Microsoft.AspNetCore.Mvc.ApplicationModels
             Selectors = new List<SelectorModel>(other.Selectors.Select(s => new SelectorModel(s)));
         }
 
+        /// <summary>
+        /// The actions on this controller.
+        /// </summary>
         public IList<ActionModel> Actions { get; }
 
         /// <summary>
@@ -90,8 +93,14 @@ namespace Microsoft.AspNetCore.Mvc.ApplicationModels
 
         string ICommonModel.Name => ControllerName;
 
+        /// <summary>
+        /// The name of this controller.
+        /// </summary>
         public string ControllerName { get; set; }
 
+        /// <summary>
+        /// The type of this controller.
+        /// </summary>
         public TypeInfo ControllerType { get; }
 
         public IList<PropertyModel> ControllerProperties { get; }
@@ -120,6 +129,9 @@ namespace Microsoft.AspNetCore.Mvc.ApplicationModels
 
         public IList<SelectorModel> Selectors { get; }
 
+        /// <summary>
+        /// The DisplayName of this controller.
+        /// </summary>
         public string DisplayName
         {
             get

src/Mvc/Mvc.Localization/src/HtmlLocalizer.cs

@@ -105,6 +105,11 @@ namespace Microsoft.AspNetCore.Mvc.Localization
         protected virtual LocalizedHtmlString ToHtmlString(LocalizedString result) =>
             new LocalizedHtmlString(result.Name, result.Value, result.ResourceNotFound);
 
+        /// <summary>
+        /// Creates a new <see cref="LocalizedHtmlString"/> for a <see cref="LocalizedString"/>.
+        /// </summary>
+        /// <param name="result">The <see cref="LocalizedString"/>.</param>
+        /// <param name="arguments">The value arguments which will be used in construting the message.</param>
         protected virtual LocalizedHtmlString ToHtmlString(LocalizedString result, object[] arguments) =>
             new LocalizedHtmlString(result.Name, result.Value, result.ResourceNotFound, arguments);
     }

src/Mvc/Mvc.NewtonsoftJson/src/DependencyInjection/MvcNewtonsoftJsonOptionsExtensions.cs

@@ -9,6 +9,9 @@ using Newtonsoft.Json.Serialization;
 
 namespace Microsoft.Extensions.DependencyInjection
 {
+    /// <summary>
+    /// Extension methods for Mvc.Newtonsoft.Json options.
+    /// </summary>
     public static class MvcNewtonsoftJsonOptionsExtensions
     {
         /// <summary>

src/Mvc/Mvc.NewtonsoftJson/src/DependencyInjection/NewtonsoftJsonMvcCoreBuilderExtensions.cs

@@ -17,6 +17,9 @@ using Microsoft.Extensions.Options;
 
 namespace Microsoft.Extensions.DependencyInjection
 {
+    /// <summary>
+    /// Extension methods for adding Newtonsoft.Json to <see cref="MvcCoreBuilder"/>.
+    /// </summary>
     public static class NewtonsoftJsonMvcCoreBuilderExtensions
     {
         /// <summary>