doc: Update URL for PL/PHP

Peter Eisentraut <peter_e@gmx.net>

Commit: b55cbb7754be4e65612eca12891a453f9db52187
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-07-11T16:13:09Z
Releases: 9.4.9
doc: Update URL for PL/PHP

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