doc: clarify major/minor pg_upgrade versions with examples

Bruce Momjian <bruce@momjian.us>

Commit: b2e6dfeacfdcf493073c8a7e7deadd34e4d5ea03
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-01-31T22:09:59Z
Releases: 10.2
doc:  clarify major/minor pg_upgrade versions with examples

The previous docs added in PG 10 were not clear enough for someone who
didn't understand the PG 10 version change, so give more specific
examples.

Reported-by: jim@room118solutions.com

Discussion: https://postgr.es/m/20171218213041.25744.8414@wrigleys.postgresql.org

Backpatch-through: 10

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doc/src/sgml/ref/pgupgrade.sgml modified +3 −3

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