Improve terminology

Peter Eisentraut <peter@eisentraut.org>

Commit: 6d6e1368722c664eef547d59ab23a29e555778c8
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-09-24T01:18:17Z
Releases: 16.0
Improve terminology

Use "prepared transaction" instead of "two-phrase transaction".  This
is in line with 0e60a50e0bf158bead247731e00cee95bcf64daf.

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