[PATCH] vfb: Document option to enable the driver

The Kconfig help text doesnt mention that in order to load the vfb module, you
have to pass in the parameter vfb_enable=1

Document required module options in Kconfig for loading the vfb module.
Signed-off-by: NAntonino Daplas <adaplas@pol.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/video/Kconfig

@@ -1619,7 +1619,8 @@ config FB_VIRTUAL
 	  kernel option `video=vfb:'.
 
 	  To compile this driver as a module, choose M here: the
-	  module will be called vfb.
+	  module will be called vfb. In order to load it, you must use
+	  the vfb_enable=1 option.
 
 	  If unsure, say N.
 if VT