doc: english polishing for README.sata

according to gvb's suggestion, polishing for the doc.

Signed-off-by: Jerry Van Baren <gerald.vanbaren@ge.com>
Signed-off-by: Dave Liu <daveliu@freescale.com>

doc/README.sata

@@ -1,11 +1,11 @@
 1. SATA usage in U-boot
 
-	Two ways to operate the hard disk
+	There are two ways to operate the hard disk
 
-	* Raw read/write block from/to SATA hard disk;
-	* ext2load read file from ext2 filesytem in hard disk
+	* Read/write raw blocks from/to SATA hard disk
+	* ext2load to read a file from ext2 file system
 
-1.0 How to know the information of SATA hard disk?
+1.0 How to read the SATA hard disk's information?
 
 	=> sata info
 
@@ -14,11 +14,12 @@ SATA device 0: Model: ST3320620AS Firm: 3.AAD Ser#:		4QF01ZTN
 	    Supports 48-bit addressing
 	    Capacity: 305245.3 MB = 298.0 GB (625142448 x 512)
 
-1.1 How to save the kernel, filesystem, dtb to SATA hard disk with raw?
+1.1 How to raw write the kernel, file system, dtb to a SATA hard disk?
 
-	Notes: 0x1000 sectors = 2 MBytes
+	Notes: Hard disk sectors are normally 512 bytes, so
+		0x1000 sectors = 2 MBytes
 
-	wirte kernel
+	write kernel
 	=> tftp 40000 /tftpboot/uImage.837x
 	=> sata write 40000 0 2000
 
@@ -30,7 +31,7 @@ SATA device 0: Model: ST3320620AS Firm: 3.AAD Ser#:		4QF01ZTN
 	=> tftp 40000 /tftpboot/mpc837xemds.dtb
 	=> sata write 40000 a000 1000
 
-1.2 How to read the kernel, filesystem, dtb from SATA hard disk with raw?
+1.2 How to raw read the kernel, file system, dtb from a SATA hard disk?
 
 	load kernel
 	=> sata read 200000 0 2000
@@ -44,11 +45,10 @@ SATA device 0: Model: ST3320620AS Firm: 3.AAD Ser#:		4QF01ZTN
 	boot
 	=> bootm 200000 1000000 2000000
 
-1.3 How to load image from ext2 filesystem in U-boot?
+1.3 How to load an image from an ext2 file system in U-boot?
 
-	U-boot doesn't support ext2 write to hard disk, so
-	you have to write the image to hard disk under Linux env,
-	before you load image from ext2 filesystem.
+	U-boot doesn't support writing to an ext2 file system, so the
+	files must be written by other means (e.g. linux).
 
 	=> ext2ls sata 0:1 /
 	<DIR>	    4096 .