more command usage cleanup

Fix up a few dangling commands like in "Command usage cleanup" commit.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

common/cmd_mmc.c

@@ -166,7 +166,7 @@ int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 
 U_BOOT_CMD(
 	mmc, 6, 1, do_mmcops,
-	"mmc	- MMC sub system\n",
+	"MMC sub system",
 	"mmc read <device num> addr blk# cnt\n"
 	"mmc write <device num> addr blk# cnt\n"
 	"mmc rescan <device num>\n"

common/cmd_ubifs.c

@@ -118,15 +118,15 @@ int do_ubifs_load(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 
 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");