rename --fakefs to --rootfs

because it can also be used on realfs

src/main.c

@@ -145,7 +145,7 @@ static struct option longopts[] = {
 	{"start-from-pongo", no_argument, NULL, 'P'},
 	{"debug-logging", no_argument, NULL, 'V'},
 	{"boot-args", required_argument, NULL, 'e'},
-	{"fakefs", required_argument, NULL, 'f'},
+	{"rootfs", required_argument, NULL, 'f'},
 	{NULL, 0, NULL, 0}};
 
 int usage(int e)
@@ -161,7 +161,7 @@ int usage(int e)
 			"\t-v, --debug-logging\t\t\tEnable debug logging\n"
 			"\t\tThis option can be repeated for extra verbosity.\n"
 			"\t-e, --boot-args <boot arguments>\tXNU boot arguments\n"
-			"\t-f, --fakefs <root device>\t\tBoots fakefs on <root device>\n",
+			"\t-f, --rootfs <root device>\t\tBoots rootful setup on <root device>\n",
 			getprogname());
 	exit(e);
 }