cleanup: fix mdoc errors in man pages

Eliminate linting errors from groff found with lintian on Debian Trixie.

Now running lintian sfptpd_3.8.0.1000_amd64.changes ...
W: sfptpd: groff-message .Nm name ... (Xilinx-CNS#11) [usr/share/man/man8/sfptpd.8.gz:2]
W: sfptpd: groff-message .Nm name ... (Xilinx-CNS#13) [usr/share/man/man8/sfptpd.8.gz:3]
W: sfptpd: groff-message .Nm name ... (#134) [usr/share/man/man8/sfptpd.8.gz:6]
W: sfptpd: groff-message .Nm name ... (#143) [usr/share/man/man8/sfptpd.8.gz:7]
W: sfptpd: groff-message .Nm name ... (#173) [usr/share/man/man8/sfptpd.8.gz:8]
W: sfptpd: groff-message .Nm name ... (#262) [usr/share/man/man8/sfptpd.8.gz:9]
W: sfptpd: groff-message .Nm name ... (#274) [usr/share/man/man8/sfptpd.8.gz:10]
W: sfptpd: groff-message .Nm name ... (#277) [usr/share/man/man8/sfptpd.8.gz:11]
W: sfptpd: groff-message .Nm name ... (#52) [usr/share/man/man8/sfptpd.8.gz:4]
W: sfptpd: groff-message .Nm name ... (#67) [usr/share/man/man8/sfptpd.8.gz:5]
W: sfptpd: groff-message .Nm name ... (Xilinx-CNS#9) [usr/share/man/man8/sfptpd.8.gz:1]
W: sfptpd-python3: groff-message .Nm name ... (Xilinx-CNS#9) [usr/share/man/man8/sfptpmon.8.gz:1]

Author: andy-bower

doc/sfptpd.8

@@ -2,9 +2,10 @@
 .Os Linux
 .Dt SFPTPD 8 SMM
 .Sh NAME
-sfptpd \- Solarflare Enhanced PTP Daemon
-.Sh SYNOPSIS
 .Nm sfptpd
+.Nd Solarflare Enhanced PTP Daemon
+.Sh SYNOPSIS
+.Nm
 .Op Fl h
 .Nm
 .Op Fl -version

doc/sfptpdctl.8

@@ -2,7 +2,9 @@
 .Os Linux
 .Dt SFPTPDCTL 8 SMM
 .Sh NAME
-sfptpdctl, sfptpdctl.py \- sfptpd control client
+.Nm sfptpdctl ,
+.Nm sfptpdctl.py
+.Nd sfptpd control client
 .Sh SYNOPSIS
 .Nm sfptpdctl
 .Op Ar command Ns Op = Ns Ar parameter

doc/sfptpmon.8

@@ -2,9 +2,10 @@
 .Os Linux
 .Dt SFPTPMON 8 SMM
 .Sh NAME
-sfptpmon \- Solarflare Enhanced PTP Monitor
-.Sh SYNOPSIS
 .Nm sfptpmon
+.Nd Solarflare Enhanced PTP Monitor
+.Sh SYNOPSIS
+.Nm
 .Op Fl h
 .Nm
 .Op Fl i Ar intf