Add NEW_LOGGING note for the commented-out "debug" and "logfile" options.

doc/man/man5/slapd.conf.5

@@ -162,6 +162,7 @@ is closed. The default is 100.
 .B conn_max_pending_auth <integer>
 Specify the maximum number of pending requests for an authenticated session.
 The default is 1000.
+.\"-- NEW_LOGGING option --
 .\".TP
 .\".B debug <subsys> <level>
 .\"Specify a logging level for a particular subsystem.  The subsystems include
@@ -454,6 +455,7 @@ is the max page size if no explicit limit is set; the keyword
 inhibits the server to return an estimate of the total number
 of entries that will be returned.
 .RE
+.\"-- NEW_LOGGING option --
 .\".TP
 .\".B logfile <filename>
 .\"Specify a file for recording debug log messages. By default these messages