[AD] Documentation update for unix specifics chapter

[Grzegorz Adam Hankiewicz <gradha@xxxxxxxxxx>]

Hi.

This patch tries to clarify a little bit the order of file paths Allegro
searches for when looking for files. Talking about that, shouldn't text
files be looked for also under /usr/local/etc? And since the search is
from "personal" to "global", shouldn't the search for binary files be:

   ./keyboard.dat
   $ALLEGRO/keyboard.dat
   ~/keyboard.dat
   /usr/local/share/allegro/keyboard.dat
   /usr/share/allegro/keyboard.dat
   /etc/keyboard.dat

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