[PATCH] skeletonfb: Documentation update

Update skeletonfb so it reflects recent (and somewhat old) changes of the
framebuffer layer.
Signed-off-by: NAntonino Daplas <adaplas@pol.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>