doc: Update URL for plr

Peter Eisentraut <peter_e@gmx.net>

Commit: cabfec988191bcaf49c9aefc777ac8b0ba35e6ec
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-02-21T17:36:35Z
Releases: 9.4.12
doc: Update URL for plr

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