[PATCH] skeletonfb: Documentation update

Update skeletonfb so it reflects recent (and somewhat old) changes of the
framebuffer layer.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>