cmdutils: fix "Commmand" typo

Signed-off-by: Lou Logan <lou@lrcd.com>

cmdutils.c

@@ -1553,7 +1553,7 @@ int show_filters(void *optctx, const char *opt, const char *arg)
     printf("Filters:\n"
            "  T.. = Timeline support\n"
            "  .S. = Slice threading\n"
-           "  ..C = Commmand support\n"
+           "  ..C = Command support\n"
            "  A = Audio input/output\n"
            "  V = Video input/output\n"
            "  N = Dynamic number and/or type of input/output\n"