docs: add preload paths to sysctl.conf.5

The patch also has other maintenance fixes, such as man header fixes,
high lighting corrections and add bug report address.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

sysctl.conf.5

@@ -6,12 +6,13 @@
 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 .\" GNU General Public License for more details."
-.TH SYSCTL.CONF 5 "21 Sep 1999" "" ""
+.TH SYSCTL.CONF "5" "January 2012" "procps-ng" "File Formats"
 .SH NAME
-sysctl.conf \- sysctl(8) preload/configuration file 
+sysctl.conf \- sysctl preload/configuration file
 .SH DESCRIPTION
-.I sysctl.conf
-is a simple file containing sysctl values to be read in and set by sysctl(8).
+.B sysctl.conf
+is a simple file containing sysctl values to be read in and set by
+.BR sysctl .
 The syntax is simply as follows:
 .RS
 .sp
@@ -20,9 +21,8 @@ The syntax is simply as follows:
 # comment
 ; comment
 
-  token  =   value
+token = value
 .fi
-.sp
 .RE
 .PP
 Note that blank lines are ignored, and whitespace before and after a token or
@@ -35,17 +35,38 @@ begin with a # or ; are considered comments and ignored.
 .ne 7
 # sysctl.conf sample
 #
-
   kernel.domainname = example.com
 ; this one has a space which will be written to the sysctl!
   kernel.modprobe = /sbin/mod probe
-
 .fi
-.sp
 .RE
 .PP
+.SH FILES
+.TP
+/run/sysctl.d/*.conf
+.TQ
+/etc/sysctl.d/*.conf
+.TQ
+/usr/local/lib/sysctl.d/*.conf
+.TQ
+/usr/lib/sysctl.d/*.conf
+.TQ
+/lib/sysctl.d/*.conf
+.TQ
+/etc/sysctl.conf
+The paths where
+sysctl
+preload files usually exit.  See also
+sysctl
+option
+.IR \-\-system .
 .SH SEE ALSO
-.BR sysctl(8)
+.BR sysctl (8)
 .SH AUTHOR
-George Staikos, <staikos@0wned.org>
-
+.UR staikos\@0wned.org
+George Staikos
+.UE
+.SH "REPORTING BUGS"
+Please send bug reports to
+.UR procps\@freelists.org
+.UE