docs: Remove "New" description of the libpqxx interface

Bruce Momjian <bruce@momjian.us>

Commit: a6bbf1c31a80abcddaad24015bbf24b340fdbea2
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-07-13T15:16:55Z
Releases: 9.4.19
docs:  Remove "New" description of the libpqxx interface

Backpatch-through: 9.3

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doc/src/sgml/external-projects.sgml modified +1 −1