fix typos in drivers/block/Kconfig

Signed-off-by: Adrian Bunk <bunk@kernel.org>

drivers/block/Kconfig

@@ -351,7 +351,7 @@ config BLK_DEV_RAM_COUNT
 	default "16"
 	depends on BLK_DEV_RAM
 	help
-	  The default value is 16 RAM disks. Change this if you know what
+	  The default value is 16 RAM disks. Change this if you know what you
 	  are doing. If you boot from a filesystem that needs to be extracted
 	  in memory, you will need at least one RAM disk (e.g. root on cramfs).
 
@@ -361,7 +361,7 @@ config BLK_DEV_RAM_SIZE
 	default "4096"
 	help
 	  The default value is 4096 kilobytes. Only change this if you know
-	  what are you doing.
+	  what you are doing.
 
 config BLK_DEV_RAM_BLOCKSIZE
 	int "Default RAM disk block size (bytes)"