git: README: Remove the secure entry; add the doc entry.

[Aaron LI]

commit b224b70ed7e311123db802d9e76505c70566e9a1
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Jun 1 12:46:21 2018 +0800

    README: Remove the secure entry; add the doc entry.
    
    Those contents resided under secure were merged into crypto some time ago.

Summary of changes:
 README | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/b224b70ed7e311123db802d9e76505c70566e9a1


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