cmd: correct long text loadb, loadx, loady

The first argument is the load address and not an offset.

The second argument cannot be entered without the first one.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/load.c b/cmd/load.c
index c6a7cc4..f252c74 100644
--- a/cmd/load.c
+++ b/cmd/load.c
@@ -1065,25 +1065,25 @@
 U_BOOT_CMD(
 	loadb, 3, 0,	do_load_serial_bin,
 	"load binary file over serial line (kermit mode)",
-	"[ off ] [ baud ]\n"
+	"[ addr [ baud ] ]\n"
 	"    - load binary file over serial line"
-	" with offset 'off' and baudrate 'baud'"
+	" at address 'addr' with baudrate 'baud'"
 );
 
 U_BOOT_CMD(
 	loadx, 3, 0,	do_load_serial_bin,
 	"load binary file over serial line (xmodem mode)",
-	"[ off ] [ baud ]\n"
+	"[ addr [ baud ] ]\n"
 	"    - load binary file over serial line"
-	" with offset 'off' and baudrate 'baud'"
+	" at address 'addr' with baudrate 'baud'"
 );
 
 U_BOOT_CMD(
 	loady, 3, 0,	do_load_serial_bin,
 	"load binary file over serial line (ymodem mode)",
-	"[ off ] [ baud ]\n"
+	"[ addr [ baud ] ]\n"
 	"    - load binary file over serial line"
-	" with offset 'off' and baudrate 'baud'"
+	" at address 'addr' with baudrate 'baud'"
 );
 
 #endif	/* CONFIG_CMD_LOADB */