Improve terminology

Peter Eisentraut <peter@eisentraut.org>

Commit: 8d985560fc1de6197323d4397d2a2bf762657463
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-09-24T01:16:08Z
Releases: 15.0
Improve terminology

Use "prepared transaction" instead of "two-phrase transaction".  This
is in line with c5d67881d343a507269bde124a49df19e0296157.

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