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/examples/standalone/README.smc91111_eeprom b/examples/standalone/README.smc91111_eeprom
index f73a8d3..0d8bc63 100644
--- a/examples/standalone/README.smc91111_eeprom
+++ b/examples/standalone/README.smc91111_eeprom
@@ -7,14 +7,14 @@
 
 Contents:
 ------------------------
-1. Ensuring U-boot's MAC address can be set in hardware
+1. Ensuring U-Boot's MAC address can be set in hardware
 2. Running the smc91111_eeprom program
 3. Setting MAC addresses
 4. Other things you can do with this
 5. Things to be done.
 
 
-1. Ensuring U-boot's MAC address can be set in hardware
+1. Ensuring U-Boot's MAC address can be set in hardware
 --------------------------------------------------------------------------
 
 On the Internet - MAC addresses are very important. Short for Media
@@ -130,14 +130,14 @@
 The MAC address can be stored in four locations:
 
 -Boot environmental variable in Flash <- can not change, without
-					  re-flashing U-boot.
+					  re-flashing U-Boot.
 U-Boot environmental variable	       <- can not change, without
 					  resetting board/U-Boot
 LAN91C111 Registers		       <- volatile
 LAN91C111 EEPROM		       <- Non-volatile
 
 If you have not activated the network, and do not have a hardcoded
-or pre-assigned MAC address in U-boot, the environmental variables
+or pre-assigned MAC address in U-Boot, the environmental variables
 should be blank, and allow you to set things one time.
 
 To set the EEPROM MAC address to 12:34:56:78:9A:BC