README.sfportscan doc update

[James Lay <jlay () slave-tothe-box net>]

Per README.sfportscan:

Example configuration:

preprocessor flow: stats_interval 0 hash 2
preprocessor sfportscan: proto { all } \
    scan_type { all } \
    sense_level { low }


Yea that goes boom:

ERROR: snort.conf(165) Unknown preprocessor: "flow".
Fatal Error, Quitting..

and:
Documentation last updated 2004-09-08

Have there really been no changes to any of sfportscan for 11 years?
Wow :)

James

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