doc: Update URL for PL/PHP

Peter Eisentraut <peter_e@gmx.net>

Commit: 740bf396a1d5cc41a8398076a9de1485c497c49c
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-07-11T16:10:10Z
Releases: 9.6.0
doc: Update URL for PL/PHP

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

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