Fix help text of ext2load and fatload.

Fix help text of ext2load and fatload to match code in fs/fs.c

Signed-off-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/common/cmd_fat.c b/common/cmd_fat.c
index fbe3346..a478017 100644
--- a/common/cmd_fat.c
+++ b/common/cmd_fat.c
@@ -27,7 +27,7 @@
 U_BOOT_CMD(
 	fatload,	7,	0,	do_fat_fsload,
 	"load binary file from a dos filesystem",
-	"<interface> [<dev[:part]>]  <addr> <filename> [bytes [pos]]\n"
+	"<interface> [<dev[:part]> [<addr> [<filename> [bytes [pos]]]]]\n"
 	"    - Load binary file 'filename' from 'dev' on 'interface'\n"
 	"      to address 'addr' from dos filesystem.\n"
 	"      'pos' gives the file position to start loading from.\n"