Standardize spelling of "nonblocking"

Peter Eisentraut <peter_e@gmx.net>

Commit: acd5803053eb5ff6ad055ac1f7670625f1d111e0
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2013-04-19T03:35:19Z
Releases: 9.3.0
Standardize spelling of "nonblocking"

Only adjusted the user-exposed messages and documentation,  not all
source code comments.

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