Include modern versions of Windows in the Linux/Unix SSH section

[MarcoZehe]

Windows 10 since "Fall Creators Update" (version 1709) comes with an OpenSSH client preinstalled. This can be used from both Command Prompt and Power Shell, no puTTY needed any more. I went through the Unix/Linux steps for SSH, and they all work as expected, including the SHA256 fingerprint display of the host upon first connection.

I suggest to change the wording in the appropriate part of the manual to also refer to these modern versions of Windows 10. Also see this German Twitter thread from November 29, 2019.