Remove final traces of long-deprecated "ramdisk" kernel parm

Since the "ramdisk" kernel parameter has been officially deprecated
since at least 2.6.18, might as well finally get rid of it.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/m68k/kernel-options.txt

@@ -192,10 +192,10 @@ Devices possible for Atari:
            seconds.
 
 
-2.6) ramdisk=
+2.6) ramdisk_size=
 -------------
 
-Syntax: ramdisk=<size>
+Syntax: ramdisk_size=<size>
 
   This option instructs the kernel to set up a ramdisk of the given
 size in KBytes. Do not use this option if the ramdisk contents are