[Bf-docboard] Minor change in Chapter V index

[Olivier SARAJA (Linuxgraphic)]

hey all,

In chapter V (Lights) I changed the order in the menu: Buffers Shadows first, 
then Ray Shadows. It makes more sense to me like this, but feel free to 
revert back to old menu if needed.

Cheers,
-- 
Olivier SARAJA