Improve documentation on logging_send_syslog_msg().

policy/modules/system/logging.if

@@ -427,6 +427,28 @@ interface(`logging_log_filetrans',`
 ## <summary>
 ##	Send system log messages.
 ## </summary>
+## <desc>
+##	<p>
+##	Allow the specified domain to connect to the
+##	system log service (syslog), to send messages be added to
+##	the system logs. Typically this is used by services
+##	that do not have their own log file in /var/log.
+##	</p>
+##	<p>
+##	This does not allow messages to be sent to
+##	the auditing system.
+##	</p>
+##	<p>
+##	Programs which use the libc function syslog() will
+##	require this access.
+##	</p>
+##	<p>
+##	Related interfaces:
+##	</p>
+##	<ul>
+##		<li>logging_send_audit_msgs()</li>
+##	</ul>
+## </desc>
 ## <param name="domain">
 ##	<summary>
 ##	Domain allowed access.