Add /dev/oldmem to devices.txt documentation

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <device@lanana.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by Dave Jones and committed by Linus Torvalds 8814842f a64314e6

+2
+2
Documentation/devices.txt
··· 94 94 9 = /dev/urandom Faster, less secure random number gen. 95 95 10 = /dev/aio Asynchronous I/O notification interface 96 96 11 = /dev/kmsg Writes to this come out as printk's 97 + 12 = /dev/oldmem Used by crashdump kernels to access 98 + the memory of the kernel that crashed. 97 99 98 100 1 block RAM disk 99 101 0 = /dev/ram0 First RAM disk