doxygen: update glsl link

Signed-off-by: Elie TOURNIER <tournier.elie@gmail.com>
Reviewed-by: Rhys Kidd <rhyskidd@gmail.com>
Tested-by: Rhys Kidd <rhyskidd@gmail.com>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
1 file changed