manuals: System message vs kernel message

Wordsmith mentions throughout the manual of syslog and dmesg, to clearly
differentiate them in an externally consisteny way, increasing operator
onboarding speed and elegance.

The daemon that handles general system messages, syslog, describes them
as "system messages", and "messages" is the standard filename. Rewrite
syslog related manual titles to align search results with this, and hier
entries to align the index. Use care to maintain keywords and not add
extra lines. Newsyslog trades "maintain" with "rotate" for visibility.

MFC after:	3 days
Reviewed by:	markj
Closes:		https://github.com/freebsd/freebsd-src/pull/2067

lib/libc/gen/syslog.3

@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd July 3, 2023
+.Dd March 8, 2026
 .Dt SYSLOG 3
 .Os
 .Sh NAME
@@ -34,7 +34,7 @@
 .Nm openlog ,
 .Nm closelog ,
 .Nm setlogmask
-.Nd control system log
+.Nd control system message log
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS

sbin/dmesg/dmesg.8

@@ -25,12 +25,12 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd May 7, 2022
+.Dd March 7, 2026
 .Dt DMESG 8
 .Os
 .Sh NAME
 .Nm dmesg
-.Nd "display the system message buffer"
+.Nd display the kernel message buffer
 .Sh SYNOPSIS
 .Nm
 .Op Fl ac
@@ -38,7 +38,7 @@
 .Sh DESCRIPTION
 The
 .Nm
-utility displays the contents of the system message buffer.
+utility displays the contents of the kernel message buffer.
 If the
 .Fl M
 option is not specified, the buffer is read from the currently running kernel

share/man/man7/hier.7

@@ -327,7 +327,7 @@ Explicitly distrusted certificates; see
 kernel state defaults; see
 .Xr sysctl.conf 5
 .It Pa syslog.conf
-system log configuration
+system message log configuration
 .It Pa ttys
 tty creation configuration; see
 .Xr getty 8
@@ -851,7 +851,7 @@ default log for system daemons
 .It Pa devd.log
 default log for device state change daemon
 .It Pa dmesg.today
-system message buffer log, rotates to
+kernel message buffer log, rotates to
 .Pa dmesg.yesterday
 .It Pa debug.log
 undiscarded debug syslog messages
@@ -862,7 +862,7 @@ logs for the line printer spooler daemon; see
 .Xr sendmail 8
 log, rotates and compresses to maillog.0.bz2
 .It Pa messages
-general system log; see
+general system message log; see
 .Xr syslogd 8
 .It Pa mount.today
 currently loaded

usr.sbin/newsyslog/newsyslog.8

@@ -14,12 +14,12 @@
 .\" the suitability of this software for any purpose.  It is
 .\" provided "as is" without express or implied warranty.
 .\"
-.Dd September 22, 2025
+.Dd March 8, 2026
 .Dt NEWSYSLOG 8
 .Os
 .Sh NAME
 .Nm newsyslog
-.Nd maintain system log files to manageable sizes
+.Nd rotate system message log files to maintain manageable sizes
 .Sh SYNOPSIS
 .Nm
 .Op Fl CFNPnrsv

usr.sbin/newsyslog/newsyslog.conf.5

@@ -18,14 +18,12 @@
 .\" the suitability of this software for any purpose.  It is
 .\" provided "as is" without express or implied warranty.
 .\"
-.Dd February 4, 2026
+.Dd March 8, 2026
 .Dt NEWSYSLOG.CONF 5
 .Os
 .Sh NAME
 .Nm newsyslog.conf
-.Nd
+.Nd system message log rotator configuration file
-.Xr newsyslog 8
-configuration file
 .Sh DESCRIPTION
 The
 .Nm

usr.sbin/syslogd/syslog.conf.5

@@ -25,14 +25,12 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd December 10, 2020
+.Dd March 8, 2026
 .Dt SYSLOG.CONF 5
 .Os
 .Sh NAME
 .Nm syslog.conf
-.Nd
+.Nd syslogd system message log configuration file
-.Xr syslogd 8
-configuration file
 .Sh DESCRIPTION
 The
 .Nm