docs: replace dblink() mention with foreign data mention

Bruce Momjian <bruce@momjian.us>

Commit: 255f14183ac7bc6a83a5bb00d67d5ac7e8b645f1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-01-12T21:53:33Z
Releases: 11.0
docs:  replace dblink() mention with foreign data mention

Reported-by: steven.winfield@cantabcapital.com

Discussion: https://postgr.es/m/20171031105039.17183.850@wrigleys.postgresql.org

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