doc: Update URL for PL/PHP

Peter Eisentraut <peter_e@gmx.net>

Commit: e1cbe5c962b278803d4c19a40109b7959aacee14
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-07-11T16:13:36Z
Releases: 9.2.18
doc: Update URL for PL/PHP

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