Mark sppp(4) as gone in FreeBSD 14.

sbin/spppcontrol/spppcontrol.8

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 30, 2001
+.Dd October 22, 2021
 .Dt SPPPCONTROL 8
 .Os
 .Sh NAME
@@ -36,6 +36,14 @@
 .Ar ifname
 .Op Ar parameter Ns Op Li = Ns Ar value
 .Op Ar ...
+.Sh DEPRECATION NOTICE
+The
+.Xr sppp 4
+module and the
+.Nm
+utility is not present in
+.Fx 14.0
+and later.
 .Sh DESCRIPTION
 The
 .Xr sppp 4

share/man/man4/ng_sppp.4

@@ -12,7 +12,7 @@
 .\" Cronyx Id: ng_sppp.4,v 1.1.2.3 2004/03/30 14:28:34 rik Exp $
 .\" $FreeBSD$
 .\"
-.Dd February 3, 2005
+.Dd October 22, 2021
 .Dt NG_SPPP 4
 .Os
 .Sh NAME
@@ -20,6 +20,12 @@
 .Nd sppp netgraph node type
 .Sh SYNOPSIS
 .In netgraph/ng_sppp.h
+.Sh DEPRECATION NOTICE
+The
+.Nm
+module is not present in
+.Fx 14.0
+and later.
 .Sh DESCRIPTION
 An
 .Nm sppp

share/man/man4/sppp.4

@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 25, 2008
+.Dd October 22, 2021
 .Dt SPPP 4
 .Os
 .Sh NAME
@@ -33,6 +33,12 @@
 .Nd point to point protocol network layer for synchronous lines
 .Sh SYNOPSIS
 .Cd "device sppp"
+.Sh DEPRECATION NOTICE
+The
+.Nm
+module is not present in
+.Fx 14.0
+and later.
 .Sh DESCRIPTION
 The
 .Nm