doxygen: Fix PROJECT_BRIEF
doxygen: Fix PROJECT_BRIEF

Change it to match the README's brief project description.

Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

janesma/waffle,chadversary/waffle,waffle-gl/waffle,janesma/waffle,dcbaker/waffle,waffle-gl/waffle,dcbaker/waffle,chadversary/waffle,evelikov/waffle,evelikov/waffle,waffle-gl/waffle,yinquan529/waffle-gl-waffle,yinquan529/waffle-gl-waffle,chadversary/waffle,fjhenigman/waffle,janesma/waffle,maurossi/waffle,fjhenigman/waffle,maurossi/waffle,dcbaker/waffle,evelikov/waffle,maurossi/waffle,yinquan529/waffle-gl-waffle,fjhenigman/waffle,waffle-gl/waffle