[Bug 2001] Document PermitOpen none in man page

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2001

--- Comment #2 from Loganaden Velvindron <loganaden at gmail.com> 2012-05-19 18:13:00 EST ---
Thank you :-)

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