doc update needed for dkim_flush_cache()

From: The - Creative <talktomenow_at_gmail.com>
Date: Wed, 11 Jul 2012 16:12:36 -0400

In http://www.opendkim.org/libopendkim/dkim_flush_cache.html, need to
change DKIM_LIBFLAG_CACHE to DKIM_LIBFLAGS_CACHE (note letter S)
Received on Wed Jul 11 2012 - 20:12:49 PST

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