docs: man page lists .log-panes, DragonFly, drops a dangling credit

FILES omitted the pane list that log --stop relies on and credited
only close with the transcript rescue that clean also performs. The
SECURITY platform list lacked DragonFly. AUTHORS pointed at additional
credits in the script header, which holds none.

party.1

@@ -342,7 +342,15 @@ out to every attached client on join/leave.
 Transcript written by
 .Cm log ;
 removed with the party directory unless rescued by
-.Cm close .
+.Cm close
+or
+.Cm clean .
+.It Pa ${PARTY_SOCKET_DIR}/party-${USER}:${NAME}.d/.log-panes
+The panes
+.Cm log
+is recording, so that
+.Cm log Fl -stop
+closes only the pipes it opened.
 .El
 .Sh EXIT STATUS
 .Bl -tag -width Ds
@@ -397,7 +405,7 @@ The OS group is the perimeter,
 .Cm server-access
 allowlist is the per-user filter.
 Both are universal across the supported platforms (Linux, FreeBSD,
-NetBSD, OpenBSD, illumos, Solaris, macOS), so the mechanism is one
+DragonFly, NetBSD, OpenBSD, illumos, Solaris, macOS), so the mechanism is one
 liner:
 .Xr chgrp 1
 +
@@ -546,7 +554,4 @@ was written by
 .An veg
 and
 .An kol3rby .
-See the
-.Pa party
-script header for additional credits.
 Issues and contributions welcome!