more command usage cleanup

Fix up a few dangling commands like in "Command usage cleanup" commit.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/common/cmd_ubifs.c b/common/cmd_ubifs.c
index b2e0f4f..4767aa4 100644
--- a/common/cmd_ubifs.c
+++ b/common/cmd_ubifs.c
@@ -118,15 +118,15 @@
 
 U_BOOT_CMD(
 	ubifsmount, 2, 0, do_ubifs_mount,
-	"ubifsmount- mount UBIFS volume\n",
+	"mount UBIFS volume",
 	"\n");
 
 U_BOOT_CMD(ubifsls, 2, 0, do_ubifs_ls,
-	   "ubifsls - list files in a directory\n",
+	   "list files in a directory",
 	   "[directory]\n"
 	   "    - list files in a 'directory' (default '/')\n");
 
 U_BOOT_CMD(ubifsload, 4, 0, do_ubifs_load,
-	   "ubifsload- load file from an UBIFS filesystem\n",
+	   "load file from an UBIFS filesystem",
 	   "<addr> <filename> [bytes]\n"
 	   "    - load file 'filename' to address 'addr'\n");