Add copy_command example for WSL

[jontze]

This PR just adds another example to the copy_command section of the documentation. I had to dig around to find out how to make copy work in WSL2 with zellij. This might save others some time.

Also I removed the colons in the faq section of the copy_command examples since this is probably a leftover from the old yaml config.

Thanks for the cool project and the hard work! ❤️

[mdbooth]

Seems to be working for me: Windows 11, WSL2, Tabby.

[andreimaxim]

Selecting whitespace with the mouse in Zellij running inside Alacritty on Windows 11 will throw the following error:

[WARN] See log at C:\Users\<username>\AppData\Local\Temp\Alacritty-<number>.log (%ALACRITTY_LOG%):
Unable to store text in clipboard: The parameter is incorrect. (os error 87)

I spent about an hour to accidentally find this ticket which completely solves the problem and it would be great to have a Windows example in the Zellij documentation.

Thank you very much @jontze!