Clean up references to SQL92

Peter Eisentraut <peter_e@gmx.net>

Commit: cc26ea9fe2e41e73c955ea75bea7a77fbd062d64
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2013-04-20T15:04:41Z
Releases: 9.3.0
Clean up references to SQL92

In most cases, these were just references to the SQL standard in
general.  In a few cases, a contrast was made between SQL92 and later
standards -- those have been kept unchanged.

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