[sslh] Logging information on manpage

[Guillaume Delacour]

Hi,

A Debian user reported[0] that it is not very easy to see (unless
looking at the source code) that sslh log to LOG_AUTH.

Please find attached a proposal to document this in the manpage.

[0]: https://bugs.debian.org/735922

-- 
Guillaume Delacour <gui at iroqwa.org>
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