Add an illustration of the advanced preferences along with some examples
from https://wiki.wireshark.org/Preferences/Layout.
Change-Id: I5dd6afe06bef9a0f5e1862f13fb716d63032cd96
Reviewed-on: https://code.wireshark.org/review/36927
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Jaap Keuter <jaap.keuter@xs4all.nl>
Gerald Combs