Add documentation for the wslinfo command

[jwiseman-obs]

Documentation Issue

There is no documentation (at https://learn.microsoft.com/en-us/windows/wsl/) or man page for the newish wslinfo command.

Link to documentation page

N/A

Suggested Improvements

Document the wslinfo command and create a man page for it to be available in a running distro. Include all options and all possible outputs, including those not normally expected (after all, documentation is most useful when things are not behaving as expected).