Delete wrong/oudated note (#4486)

Author: Youssef1313

xml/System.Net.Sockets/TcpClient.xml

@@ -1632,9 +1632,6 @@ The `GetStream` method returns a <xref:System.Net.Sockets.NetworkStream> that yo
   
  You must call the <xref:System.Net.Sockets.TcpClient.Connect%2A> method first, or the <xref:System.Net.Sockets.TcpClient.GetStream%2A> method will throw an <xref:System.InvalidOperationException>. After you have obtained the `NetworkStream`, call the <xref:System.Net.Sockets.NetworkStream.Write%2A> method to send data to the remote host. Call the <xref:System.Net.Sockets.NetworkStream.Read%2A> method to receive data arriving from the remote host. Both of these methods block until the specified operation is performed. You can avoid blocking on a read operation by checking the <xref:System.Net.Sockets.NetworkStream.DataAvailable%2A> property. A `true` value means that data has arrived from the remote host and is available for reading. In this case, <xref:System.Net.Sockets.NetworkStream.Read%2A> is guaranteed to complete immediately. If the remote host has shutdown its connection, <xref:System.Net.Sockets.NetworkStream.Read%2A> will immediately return with zero bytes.  
   
-> [!NOTE]
->  You must close the `NetworkStream` when you are through sending and receiving data. Closing <xref:System.Net.Sockets.TcpClient> does not release the `NetworkStream`.  
-  
 > [!NOTE]
 >  If you receive a <xref:System.Net.Sockets.SocketException>, use <xref:System.Net.Sockets.SocketException.ErrorCode%2A?displayProperty=nameWithType> to obtain the specific error code. After you have obtained this code, you can refer to the [Windows Sockets version 2 API error code](/windows/desktop/winsock/windows-sockets-error-codes-2) documentation for a detailed description of the error.