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/stv0991.h b/include/configs/stv0991.h
index f421321..6db628a 100644
--- a/include/configs/stv0991.h
+++ b/include/configs/stv0991.h
@@ -45,7 +45,7 @@
 #define CONFIG_SYS_INIT_RAM_ADDR		0x00190000
 #define CONFIG_SYS_INIT_SP_OFFSET		\
 	(CONFIG_SYS_INIT_RAM_SIZE - GENERATED_GBL_DATA_SIZE)
-/* U-boot Load Address */
+/* U-Boot Load Address */
 #define CONFIG_SYS_TEXT_BASE			0x00010000
 #define CONFIG_SYS_INIT_SP_ADDR			\
 	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)