doc: Update URL for plr

Peter Eisentraut <peter_e@gmx.net>

Commit: 931182fe3a2c7725238d4351f42c5318b4143bee
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-02-21T17:35:57Z
Releases: 9.5.7
doc: Update URL for plr

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