Change default commit_delay to zero, update documentation.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 57e084718097bd03598a3db8c06b3ba72670737d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-02-18T04:50:43Z
Releases: 7.1.1
Change default commit_delay to zero, update documentation.

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