Add passwd manpage

passwd.1

@@ -0,0 +1,13 @@
+.TH PASSWD 1 ubase-VERSION
+.SH NAME
+\fBpasswd\fR - Change a user's password
+.SH SYNOPSIS
+\fBpasswd\fR \fIusername\fR
+.SH DESCRIPTION
+\fBpasswd\fR changes the user's password. The user is prompted
+for their current password.  If the current password is correctly typed,
+a new password is requested.  The new password must be entered twice to
+avoid typing errors.  The superuser is not required to provide a user's
+current password.
+.SH BUGS
+Currently there's no shadow support.

passwd.c

@@ -15,7 +15,7 @@
 static void
 usage(void)
 {
-	eprintf("usage: %s login\n", argv0);
+	eprintf("usage: %s username\n", argv0);
 }
 
 int

su.1

@@ -2,13 +2,13 @@
 .SH NAME
 \fBsu\fR - Run a command with a substitute user and group ID
 .SH SYNOPSIS
-\fBsu\fR [\fB-lp\fR] [\fIuser\fR]
+\fBsu\fR [\fB-lp\fR] [\fIusername\fR]
 .SH DESCRIPTION
 \fBsu\fR allows to run commands with a substitute user and group ID.
 When called without arguments, su defaults to running an interactive shell
 as root.  For backward compatibility su defaults to not change the current
 directory and to only set the environment variables \fBHOME\fR and \fBSHELL\fR
-(plus \fBUSER\fR and \fBLOGNAME\fR if target \fIuser\fR is not root).
+(plus \fBUSER\fR and \fBLOGNAME\fR if the target \fIusername\fR is not root).
 .SH OPTIONS
 .TP
 \fB-l\fR

su.c

@@ -18,7 +18,7 @@ static int dologin(struct passwd *);
 static void
 usage(void)
 {
-	eprintf("usage: %s [-lp] [user]\n", argv0);
+	eprintf("usage: %s [-lp] [username]\n", argv0);
 }
 
 static int lflag = 0;