git: if_tap: Update tap.4 man page to match the code

[Aaron LI]

commit f892bb77a871d61424d8de69d00ff4989f595f16
Author: Aaron LI <aly at aaronly.me>
Date:   Mon Jul 9 18:53:42 2018 +0800

    if_tap: Update tap.4 man page to match the code
    
    Remove the description on FIONBIO ioctl since ours doesn't support it.
    
    Mainly taken from FreeBSD, with some improvements.

Summary of changes:
 share/man/man4/tap.4 | 146 +++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 106 insertions(+), 40 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f892bb77a871d61424d8de69d00ff4989f595f16


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