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/include/configs/omap3_evm_quick_nand.h b/include/configs/omap3_evm_quick_nand.h
index 124e8c6..bb908fa 100644
--- a/include/configs/omap3_evm_quick_nand.h
+++ b/include/configs/omap3_evm_quick_nand.h
@@ -16,7 +16,7 @@
 #include <asm/arch/omap.h>
 
 /* ----------------------------------------------------------------------------
- * Supported U-boot commands
+ * Supported U-Boot commands
  * ----------------------------------------------------------------------------
  */
 #define CONFIG_CMD_NAND
@@ -29,7 +29,7 @@
  */
 
 /* ----------------------------------------------------------------------------
- * Supported U-boot features
+ * Supported U-Boot features
  * ----------------------------------------------------------------------------
  */
 #define CONFIG_SILENT_CONSOLE