sysctl.conf(5): Mention sysctl.conf.local in the sysctl.conf(5) manua…

…l page

The possibility of using a sysctl.conf.local on a machine that has a shared
sysctl.conf(5) isn't documented. So mention the sysctl.conf.local in the
manual page.

PR:	254901
Submitted by:	Jose Luis Duran <jlduran at gmail dot com>
Reported by:	Jose Luis Duran <jlduran at gmail dot com>
Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D29673

(cherry picked from commit 46c9952)

share/man/man5/sysctl.conf.5

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 21, 2018
+.Dd April 8, 2021
 .Dt SYSCTL.CONF 5
 .Os
 .Sh NAME
@@ -52,10 +52,13 @@ as seen in the
 .Sx EXAMPLES
 section, below.
 .Sh FILES
-.Bl -tag -width /etc/sysctl.conf -compact
+.Bl -tag -width /etc/sysctl.conf.local -compact
 .It Pa /etc/sysctl.conf
 Initial settings for
 .Xr sysctl 8 .
+.It Pa /etc/sysctl.conf.local
+Machine-specific settings for sites with a common
+.Pa /etc/sysctl.conf .
 .El
 .Sh EXAMPLES
 To turn off logging of programs that exit due to fatal signals you may use