tcpsso: fix TIME_WAIT description in man-page

Reviewed by: manpages(pauamma_gundo.com)
Fixes: e179d9739b14 ("tcpsso: support TIME_WAIT state")
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D43424

(cherry picked from commit 256fe4a15484d72452ada288f5a3d9c9672b2d57)