doc: Update URL for plr

Peter Eisentraut <peter_e@gmx.net>

Commit: 7248099c169b40b8f70cdaf8e12d0deaab9b16e2
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-02-21T17:37:30Z
Releases: 10.0
doc: Update URL for plr

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

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