trivial: Fix booot occurences

s/booot/boot/g

The first ase is booot instead of boot and second u-booot instead of
u-boot.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/cmd/mmc.c b/cmd/mmc.c
index 97e5d91..1c252e0 100644
--- a/cmd/mmc.c
+++ b/cmd/mmc.c
@@ -1004,7 +1004,7 @@
 	"mmc part - lists available partition on current mmc device\n"
 	"mmc dev [dev] [part] - show or set current mmc device [partition]\n"
 	"mmc list - lists available devices\n"
-	"mmc wp - power on write protect booot partitions\n"
+	"mmc wp - power on write protect boot partitions\n"
 #if CONFIG_IS_ENABLED(MMC_HW_PARTITIONING)
 	"mmc hwpartition [args...] - does hardware partitioning\n"
 	"  arguments (sizes in 512-byte blocks):\n"