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/doc/README.mpc85xxads b/doc/README.mpc85xxads
index 28bbcbe..ef92739 100644
--- a/doc/README.mpc85xxads
+++ b/doc/README.mpc85xxads
@@ -107,7 +107,7 @@
 2. MEMORY MAP TO WORK WITH LINUX KERNEL
 
 2.1. For the initial bringup, we adopted a consistent memory scheme
-     between u-boot and linux kernel, you can customize it based on your
+     between U-Boot and linux kernel, you can customize it based on your
      system requirements:
 
      0x0000_0000     0x7fff_ffff     DDR		     2G
@@ -192,7 +192,7 @@
     and future revisions of 8540/8560.
 
 
-4.4 Reflash U-boot Image using U-boot
+4.4 Reflash U-Boot Image using U-Boot
 
     tftp 10000 u-boot.bin
     protect off fff80000 ffffffff