docs: Fix invalid cref values in docs (#1329)

Signed-off-by: Still Hsu <341464@gmail.com>

src/Discord.Net.Rest/Entities/Channels/IRestMessageChannel.cs

@@ -30,7 +30,7 @@ namespace Discord.Rest
         /// </summary>
         /// <remarks>
         ///     This method follows the same behavior as described in 
-        ///     <see cref="IMessageChannel.SendFileAsync(string, string, bool, Embed, RequestOptions)"/>. Please visit
+        ///     <see cref="IMessageChannel.SendFileAsync(string, string, bool, Embed, RequestOptions, bool)"/>. Please visit
         ///     its documentation for more details on this method.
         /// </remarks>
         /// <param name="filePath">The file path of the file.</param>

src/Discord.Net.WebSocket/BaseSocketClient.Events.cs

@@ -136,7 +136,7 @@ namespace Discord.WebSocket
         ///     </note>
         ///     <para>
         ///         This event is fired when multiple messages are bulk deleted. The event handler must return a
-        ///         <see cref="Task"/> and accept an <see cref="IReadOnlyCollection{Cacheable{TEntity,TId}}"/> and 
+        ///         <see cref="Task"/> and accept an <see cref="IReadOnlyCollection{Cacheable}"/> and 
         ///         <see cref="ISocketMessageChannel"/> as its parameters.
         ///     </para>
         ///     <para>

src/Discord.Net.WebSocket/DiscordSocketConfig.cs

@@ -96,7 +96,8 @@ namespace Discord.WebSocket
         ///         due to this issue. This may be resolved at v3 of the library. Until then, you may want to consider
         ///         overriding the TypeReader and use
         ///         <see cref="DiscordRestClient.GetUserAsync(System.UInt64,Discord.RequestOptions)"/> 
-        ///         or <see cref="DiscordSocketRestClient.GetGuildUserAsync(ulong, ulong, RequestOptions)"/> as a backup.
+        ///         or <see cref="DiscordRestClient.GetGuildUserAsync"/>
+        ///         as a backup.
         ///     </note>
         /// </remarks>
         public bool AlwaysDownloadUsers { get; set; } = false;

src/Discord.Net.WebSocket/Entities/Channels/ISocketMessageChannel.cs

@@ -56,7 +56,7 @@ namespace Discord.WebSocket
         ///     Sends a file to this message channel with an optional caption.
         /// </summary>
         /// <remarks>
-        ///     This method follows the same behavior as described in <see cref="IMessageChannel.SendFileAsync(Stream, string, string, bool, Embed, RequestOptions)"/>.
+        ///     This method follows the same behavior as described in <see cref="IMessageChannel.SendFileAsync(Stream, string, string, bool, Embed, RequestOptions, bool)"/>.
         ///     Please visit its documentation for more details on this method.
         /// </remarks>
         /// <param name="stream">The <see cref="Stream" /> of the file to be sent.</param>

src/Discord.Net.WebSocket/Entities/Channels/SocketNewsChannel.cs

@@ -7,7 +7,7 @@ using Model = Discord.API.Channel;
 namespace Discord.WebSocket
 {
     /// <summary>
-    ///     Represents a WebSocket-based news channel in a guild that has the same properties as a <see cref="RestTextChannel"/>.
+    ///     Represents a WebSocket-based news channel in a guild that has the same properties as a <see cref="SocketTextChannel"/>.
     /// </summary>
     [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
     public class SocketNewsChannel : SocketTextChannel