[pgpool-hackers: 2877] Fix Pgpool-II Manual

[Takuma Hoshiai]

Hi all,

Found mistake for Pgpool-II Manual, so I created that patch. 
This patch fixes typo, and adds explain.

Please comment, if there is a more better idea.

Regards.

-- 
Takuma Hoshiai <hoshiai at sraoss.co.jp>
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