Fixed a typo in ISnowflakeEntity

src/Discord.Net.Core/Entities/ISnowflakeEntity.cs

@@ -6,7 +6,7 @@ namespace Discord
     public interface ISnowflakeEntity : IEntity<ulong>
     {
         /// <summary>
-        ///     Gets when the snowflake is created.
+        ///     Gets when the snowflake was created.
         /// </summary>
         /// <returns>
         ///     A <see cref="DateTimeOffset"/> representing when the entity was first created.