Re: rdsetroot.8: sync synopsis with usage, improve wording

[Klemens Nanni]

Alright, sorry for the noise.

Is this minimal sync plus stdout mention fine?

Index: rdsetroot.8
===================================================================
RCS file: /cvs/src/usr.sbin/rdsetroot/rdsetroot.8,v
retrieving revision 1.2
diff -u -p -r1.2 rdsetroot.8
--- rdsetroot.8 5 Apr 2019 21:44:32 -0000       1.2
+++ rdsetroot.8 20 Jan 2023 16:58:56 -0000
@@ -45,6 +45,11 @@ Debug.
 Rather than inserting, extract the
 .Ar disk.fs
 image.
+If
+.Ar disk.fs
+is not speficied,
+.Nm
+writes to standard output.
 The disk can be made accessible using
 .Xr vnconfig 8 ,
 filesystems can be manipulated, and finally re-inserted into the RAMDISK 
kernel.
Index: rdsetroot.c
===================================================================
RCS file: /cvs/src/usr.sbin/rdsetroot/rdsetroot.c,v
retrieving revision 1.3
diff -u -p -r1.3 rdsetroot.c
--- rdsetroot.c 24 Oct 2021 21:24:19 -0000      1.3
+++ rdsetroot.c 20 Jan 2023 16:58:58 -0000
@@ -294,6 +294,6 @@ usage(void)
 {
        extern char *__progname;
 
-       fprintf(stderr, "usage: %s [-dx] bsd [fs]\n", __progname);
+       fprintf(stderr, "usage: %s [-dx] kernel [disk.fs]\n", __progname);
        exit(1);
 }