Option -s needs further description

[morenathan]

Issue:
"-s" "--search-paths" seems to only work with "-a" "--autostart" but the option is not explained that way.

Given the way it is described I would exect this commandline
dex -s "$SOMEDIR/applications:/usr/share/applications" application.desktop
to search first, then in the second directory "to search for desktop files" that match "application.desktop".

Solution:
Simply change man to note: "(Only works with the autostart option.)"