Add some documentation for the shipping_hide_if_one listener. Closes #780
Add some documentation for the shipping_hide_if_one listener. Closes #780

Ryati/satchmo,twidi/satchmo,Ryati/satchmo,dokterbob/satchmo,ringemup/satchmo,dokterbob/satchmo,twidi/satchmo,ringemup/satchmo