Not a must to close the NetworkStream separately

Close() internally invokes Dispose() which in turns disposes of the stream, but the doc says "You must close the NetworkStream when you are through sending and receiving data. Closing TcpClient does not release the NetworkStream."

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#### Document Details

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* ID: fe7d0846-14ff-cce4-2ce5-4df4ba9b5ee5
* Version Independent ID: c1cc7165-fee6-6af3-087b-36a337774399
* Content: [TcpClient.GetStream Method (System.Net.Sockets)](https://docs.microsoft.com/en-us/dotnet/api/system.net.sockets.tcpclient.getstream?view=netframework-4.7.2)
* Content Source: [xml/System.Net.Sockets/TcpClient.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Net.Sockets/TcpClient.xml)
* Product: **dotnet-api**
* GitHub Login: @karelz
* Microsoft Alias: **ncldev**