cmd_mmc.c: Fix typo, "dislay" -> "display"

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>

common/cmd_mmc.c

@@ -144,7 +144,7 @@ static int do_mmcinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 U_BOOT_CMD(
 	mmcinfo, 1, 0, do_mmcinfo,
 	"display MMC info",
-	"- dislay info of the current MMC device"
+	"- display info of the current MMC device"
 );
 
 static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])