[Minor Fix]: Doc update for Windows Users (#465)
[Minor Fix]: Doc update for Windows Users (#465)

A minor change was fixed in `doc.go:142` for Windows Users. Clear instructions for using `$f`, `$fs`, `$fx` and `$id` in Windows as `%f%`, `%fs%`, `%fx%` and `%id%`.
gokcehan/lf,gokcehan/lf