fix ws + add doc

ixwebsocket/IXSocketMbedTLS.cpp

@@ -82,7 +82,7 @@ namespace ix
         mbedtls_ssl_set_bio(&_ssl, &_sockfd, mbedtls_net_send, mbedtls_net_recv, NULL);
 
         int res;
-        do 
+        do
         {
             res = mbedtls_ssl_handshake(&_ssl);
         }

ixwebsocket/IXWebSocketMessageQueue.cpp

@@ -81,7 +81,7 @@ namespace ix
     {
         _onMessageUserCallback = std::move(callback);
     }
-    
+
     WebSocketMessageQueue::MessagePtr WebSocketMessageQueue::popMessage()
     {
         MessagePtr message;

ixwebsocket/IXWebSocketTransport.cpp

@@ -1041,7 +1041,7 @@ namespace ix
         _requestInitCancellation = true;
 
         if (_readyState == ReadyState::CLOSING || _readyState == ReadyState::CLOSED) return;
-        
+
         {
             std::lock_guard<std::mutex> lock(_closeDataMutex);
             _closeCode = code;