Docs: Improve library import info

[whyman]

Reminder, transcript from IRC (#gerbera)

[22:23:16] <usney> hello
[22:23:25] <usney> anyone here to help?
[22:23:55] <usney> is it possible to edit the directories you want to use via the xml file instead of using the browser?
[22:24:13] <usney> I am using a cli only system server
[20:12:19] <Thev00d00> usney: yep!
[20:13:41] <Thev00d00> usney: http://docs.gerbera.io/en/latest/config-import.html
[20:13:41] <usney> link Thev00d00 
[20:13:49] <usney> thank you so much Thev00d00 
[20:14:25] <Thev00d00> You w ant an autoscan tag
[20:14:49] <Thev00d00> That documentation tbh is not great, I will make a note to improve it
[20:16:00] <Thev00d00> usney: there is an example tag: https://gist.github.com/v00d00/76120fcdfcfd3f24abb692737591dfef