doc: Add link to upgrading chapter to release notes

Peter Eisentraut <peter@eisentraut.org>

Commit: e05a3b490a258293c017bd107813c2d78813fab0
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2020-01-09T15:02:23Z
Releases: 12.2
doc: Add link to upgrading chapter to release notes

Author: Vik Fearing <vik.fearing@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/54c208b9-7e2c-6211-0ba0-ffb0429cf20b@2ndquadrant.com

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doc/src/sgml/release-12.sgml modified +5 −3

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