Improve error message wording

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: cb9b66d31ad4bcd37226f20d651a213323621b89
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2013-02-06T03:19:53Z
Releases: 9.3.0
Improve error message wording

The wording changes applied in 0ac5ad513 were universally disliked.

Per gripe from Andrew Dunstan

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