doc: Update URL for plr

Peter Eisentraut <peter_e@gmx.net>

Commit: efc286643f33ce2949e5210338cb5cca0426eb04
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-02-21T17:34:53Z
Releases: 9.6.3
doc: Update URL for plr

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

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