doc: Update link

Peter Eisentraut <peter_e@gmx.net>

Commit: f58b664393dcfd02c2f57b3ff20fc0aee6dfebf1
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-04-21T23:42:01Z
Releases: 10.0
doc: Update link

The reference "That is the topic of the next section." has been
incorrect since the materialized views documentation got inserted
between the section "rules-views" and "rules-update".

Author: Zertrin <postgres_wiki@zertrin.org>

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doc/src/sgml/rules.sgml modified +1 −1

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