[Refactor] Refactor some stuff (#2688)

* fix some `internal` classes being exposed

* update xmldoc comments to use `<see langword>`

* bump library version in samples

* fix possible oversight

src/Discord.Net.Interactions/Attributes/PreconditionAttribute.cs

@@ -15,7 +15,7 @@ namespace Discord.Interactions
         /// </summary>
         /// <remarks>
         ///     <see cref="Preconditions" /> of the same group require only one of the preconditions to pass in order to
-        ///     be successful (A || B). Specifying <see cref="Group" /> = <c>null</c> or not at all will
+        ///     be successful (A || B). Specifying <see cref="Group" /> = <see langword="null" /> or not at all will
         ///     require *all* preconditions to pass, just like normal (A &amp;&amp; B).
         /// </remarks>
         public string Group { get; set; } = null;

src/Discord.Net.Interactions/InteractionService.cs

@@ -250,7 +250,7 @@ namespace Discord.Interactions
         ///     Create and loads a <see cref="ModuleInfo"/> using a builder factory.
         /// </summary>
         /// <param name="name">Name of the module.</param>
-        /// <param name="services">The <see cref="IServiceProvider"/> for your dependency injection solution if using one; otherwise, pass <c>null</c>.</param>
+        /// <param name="services">The <see cref="IServiceProvider"/> for your dependency injection solution if using one; otherwise, pass <see langword="null" />.</param>
         /// <param name="buildFunc">Module builder factory.</param>
         /// <returns>
         ///     A task representing the operation for adding modules. The task result contains the built module instance.
@@ -280,7 +280,7 @@ namespace Discord.Interactions
         ///     Discover and load command modules from an <see cref="Assembly"/>.
         /// </summary>
         /// <param name="assembly"><see cref="Assembly"/> the command modules are defined in.</param>
-        /// <param name="services">The <see cref="IServiceProvider"/> for your dependency injection solution if using one; otherwise, pass <c>null</c>.</param>
+        /// <param name="services">The <see cref="IServiceProvider"/> for your dependency injection solution if using one; otherwise, pass <see langword="null" />.</param>
         /// <returns>
         ///     A task representing the operation for adding modules. The task result contains a collection of the modules added.
         /// </returns>
@@ -312,7 +312,7 @@ namespace Discord.Interactions
         ///     Add a command module from a <see cref="Type"/>.
         /// </summary>
         /// <typeparam name="T">Type of the module.</typeparam>
-        /// <param name="services">The <see cref="IServiceProvider" /> for your dependency injection solution if using one; otherwise, pass <c>null</c> .</param>
+        /// <param name="services">The <see cref="IServiceProvider" /> for your dependency injection solution if using one; otherwise, pass <see langword="null" /> .</param>
         /// <returns>
         ///     A task representing the operation for adding the module. The task result contains the built module.
         /// </returns>
@@ -329,7 +329,7 @@ namespace Discord.Interactions
         ///     Add a command module from a <see cref="Type"/>.
         /// </summary>
         /// <param name="type">Type of the module.</param>
-        /// <param name="services">The <see cref="IServiceProvider" /> for your dependency injection solution if using one; otherwise, pass <c>null</c> .</param>
+        /// <param name="services">The <see cref="IServiceProvider" /> for your dependency injection solution if using one; otherwise, pass <see langword="null" /> .</param>
         /// <returns>
         ///     A task representing the operation for adding the module. The task result contains the built module.
         /// </returns>

src/Discord.Net.Interactions/Results/AutocompletionResult.cs

@@ -91,7 +91,7 @@ namespace Discord.Interactions
         ///     Gets a string that indicates the autocompletion result.
         /// </summary>
         /// <returns>
-        ///     <c>Success</c> if <see cref="IsSuccess"/> is <c>true</c>; otherwise "<see cref="Error"/>: 
+        ///     <c>Success</c> if <see cref="IsSuccess"/> is <see langword="true" />; otherwise "<see cref="Error"/>: 
         ///     <see cref="ErrorReason"/>".
         /// </returns>
         public override string ToString() => IsSuccess ? "Success" : $"{Error}: {ErrorReason}";

src/Discord.Net.Interactions/Results/RuntimeResult.cs

@@ -17,7 +17,7 @@ namespace Discord.Interactions
         /// <summary>
         ///     Initializes a new <see cref="RuntimeResult" /> class with the type of error and reason.
         /// </summary>
-        /// <param name="error">The type of failure, or <c>null</c> if none.</param>
+        /// <param name="error">The type of failure, or <see langword="null" /> if none.</param>
         /// <param name="reason">The reason of failure.</param>
         protected RuntimeResult(InteractionCommandError? error, string reason)
         {
@@ -29,7 +29,7 @@ namespace Discord.Interactions
         ///     Gets a string that indicates the runtime result.
         /// </summary>
         /// <returns>
-        ///     <c>Success</c> if <see cref="IsSuccess"/> is <c>true</c>; otherwise "<see cref="Error"/>: 
+        ///     <c>Success</c> if <see cref="IsSuccess"/> is <see langword="true" />; otherwise "<see cref="Error"/>: 
         ///     <see cref="ErrorReason"/>".
         /// </returns>
         public override string ToString() => ErrorReason ?? (IsSuccess ? "Successful" : "Unsuccessful");