fixing a comment typo

src/Discord.Net/WebSocket/DiscordSocketClient.cs

@@ -38,7 +38,7 @@ namespace Discord.WebSocket
         private int _nextAudioId;
         private bool _canReconnect;
 
-        /// <summary> Gets the shard if of this client. </summary>
+        /// <summary> Gets the shard id of this client. </summary>
         public int ShardId { get; }
         /// <summary> Gets the current connection state of this client. </summary>
         public ConnectionState ConnectionState { get; private set; }