Convert to mdoc format, and rewrite most of the man page

while I was at it.

usr.sbin/accton/accton.8

@@ -1,22 +1,34 @@
-.TH ACCTON 8 "21 May 1993"
-.SH NAME
-.\" accton \- system accounting
-accton \- system accounting
-.SH SYNOPSIS
-accton [\fIfile\fR]
-.SH DESCRIPTION
-.B accton
-is a command for switching system accounting on or off.
-If called with \fIfile\fR system accounting is turned on and
-for every executed command a record is stored in \fIfile\fR.
-If called without an argument accounting is turned off.
-
-.SH FILES
-.TP 20
-/var/account/*
-normal place for the accounting files.
-.SH SEE ALSO
-
-.IR acct (2),
-.IR sa (8).
-
+.Dd "May 21, 1993"
+.Dt ACCTON 8
+.Os
+.Sh NAME
+.Nm accton
+.Nd enable/disable system accounting
+.Sh SYNOPSIS
+.Nm accton
+.Op Ar acctfile
+.Sh DESCRIPTION
+The
+.Nm
+command is used 
+for switching system accounting on or off.
+If called with the argument
+.Ar acctfile ,
+system accounting is enabled and a record of
+every process that is started by the
+.Xr execve 2
+system call and then later exits the system is stored in
+.Ar acctfile .
+The
+.Xr sa 8
+command may be used to examing the accounting records.
+If no arguments are given, system account is disabled.
+.Sh FILES
+.Bl -tag -width /var/account/acct
+.It Pa /var/account/acct
+Default accounting file.
+.El
+.Sh SEE ALSO
+.Xr lastcomm 1 ,
+.Xr acct 2 ,
+.Xr sa 8