[S390] Remove obsolete recommendation for 8M ramdisk size.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 4245b7f..ca4d7f0 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -361,8 +361,7 @@
 	default "4096"
 	help
 	  The default value is 4096 kilobytes. Only change this if you know
-	  what are you doing. If you are using IBM S/390, then set this to
-	  8192.
+	  what are you doing.
 
 config BLK_DEV_RAM_BLOCKSIZE
 	int "Default RAM disk block size (bytes)"