Use correct spelling of "U-Boot"

Correct spelling of "U-Boot" shall be used in all written text
(documentation, comments in source files etc.).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/board/freescale/mpc8323erdb/README b/board/freescale/mpc8323erdb/README
index 6f89829..9a46da0 100644
--- a/board/freescale/mpc8323erdb/README
+++ b/board/freescale/mpc8323erdb/README
@@ -22,10 +22,10 @@
 
 3.	Downloading and Flashing Images
 
-3.1	Reflash U-boot Image using U-boot
+3.1	Reflash U-Boot Image using U-Boot
 
 	N.b, have an alternate means of programming
-	the flash available if the new u-boot doesn't boot.
+	the flash available if the new U-Boot doesn't boot.
 
 	First try a:
 
@@ -44,7 +44,7 @@
 	erase fe000000 +$filesize
 	cp.b $loadaddr fe000000 $filesize
 
-	To keep your old u-boot's environment variables, do a:
+	To keep your old U-Boot's environment variables, do a:
 
 	saveenv