doc: Update URL for PL/PHP

Peter Eisentraut <peter_e@gmx.net>

Commit: 2d22c3b701ca1283eeb504d0fe75e8c595e5523b
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-07-11T16:12:04Z
Releases: 9.5.4
doc: Update URL for PL/PHP

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