git: if_tun: Update tun.4 man page to match the code

[Aaron LI]

commit b24712baecd0d6a60456e438a12293241e320636
Author: Aaron LI <aly at aaronly.me>
Date:   Tue Jul 17 19:04:12 2018 +0800

    if_tun: Update tun.4 man page to match the code
    
    Mainly follow FreeBSD's tun.4, refer to NetBSD's tun.4, and with my own
    minor adjustments.

Summary of changes:
 share/man/man4/tun.4 | 122 +++++++++++++++++++++++++++++++++++----------------
 1 file changed, 83 insertions(+), 39 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/b24712baecd0d6a60456e438a12293241e320636


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