Add example and fix param reference

src/Discord.Net.Commands/CommandService.cs

@@ -367,8 +367,13 @@ namespace Discord.Commands
         ///     Adds a custom entity <see cref="TypeReader" /> to this <see cref="CommandService" /> for the supplied
         ///     object type.
         /// </summary>
+        /// <example>
+        ///     <para>The following example adds a custom entity reader to this <see cref="CommandService"/>.</para>
+        ///     <code language="cs" region="AddEntityTypeReader"
+        ///           source="..\..\..\Discord.Net.Examples\Commands\CommandService.Examples.cs" />
+        /// </example>
         /// <typeparam name="T">The object type to be read by the <see cref="TypeReader"/>.</typeparam>
-        /// <param name="typeReaderType">
+        /// <param name="typeReaderGenericType">
         ///     A <see cref="Type" /> that is a generic type definition with a single open argument
         ///     of the <see cref="TypeReader" /> to be added.
         /// </param>
@@ -379,7 +384,7 @@ namespace Discord.Commands
         ///     object type.
         /// </summary>
         /// <param name="type">A <see cref="Type" /> instance for the type to be read.</param>
-        /// <param name="typeReaderType">
+        /// <param name="typeReaderGenericType">
         ///     A <see cref="Type" /> that is a generic type definition with a single open argument
         ///     of the <see cref="TypeReader" /> to be added.
         /// </param>

src/Discord.Net.Examples/Commands/CommandService.Examples.cs

@@ -0,0 +1,32 @@
+using Discord.Commands;
+using JetBrains.Annotations;
+using System;
+using System.Threading.Tasks;
+
+namespace Discord.Net.Examples.Commands
+{
+    [PublicAPI]
+    internal class CommandServiceExamples
+    {
+        #region AddEntityTypeReader
+
+        public void AddCustomEntityReader(CommandService commandService)
+        {
+            commandService.AddEntityTypeReader<IUser>(typeof(MyUserTypeReader<>));
+        }
+
+        public class MyUserTypeReader<T> : TypeReader
+            where T : class, IUser
+        {
+            public override async Task<TypeReaderResult> ReadAsync(ICommandContext context, string input, IServiceProvider services)
+            {
+                if (ulong.TryParse(input, out var id))
+                    return ((await context.Client.GetUserAsync(id)) is T user)
+                        ? TypeReaderResult.FromSuccess(user)
+                        : TypeReaderResult.FromError(CommandError.ObjectNotFound, "User not found.");
+                return TypeReaderResult.FromError(CommandError.ParseFailed, "Couldn't parse input to ulong.");
+            }
+
+        #endregion
+    }
+}

src/Discord.Net.Examples/Discord.Net.Examples.csproj

@@ -13,6 +13,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\Discord.Net.Commands\Discord.Net.Commands.csproj" />
     <ProjectReference Include="..\Discord.Net.Core\Discord.Net.Core.csproj" />
     <ProjectReference Include="..\Discord.Net.WebSocket\Discord.Net.WebSocket.csproj" />
     <PackageReference Include="JetBrains.Annotations" Version="2019.1.3" />