Format the project with 'dotnet format' (#2551)

* Sync and Re-Format

* Fix Title string.

* Fix indentation.

src/Discord.Net.Rest/API/UnixTimestampAttribute.cs

@@ -1,7 +1,7 @@
-using System;
+using System;
 
 namespace Discord.API
 {
     [AttributeUsage(AttributeTargets.Property)]
     internal class UnixTimestampAttribute : Attribute { }
-}
+}