doc: update PG 10 item about referencing many relations

Bruce Momjian <bruce@momjian.us>

Commit: ef0ba572b6e163328a2292bf9d6de7c919bd7cdd
Author: Bruce Momjian <bruce@momjian.us>
Date: 2017-04-25T17:47:51Z
Releases: 10.0
doc:  update PG 10 item about referencing many relations

Reported-by: Tom Lane

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doc/src/sgml/release-10.sgml modified +2 −2

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