doc: clarify behavior of pg_upgrade's clone mode

Bruce Momjian <bruce@momjian.us>

Commit: 26950273dc27ec7775029cffe1140165f942325d
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-05-01T13:09:28Z
Releases: 12.0
doc:  clarify behavior of pg_upgrade's clone mode

Be more precise about the benefits of using clone mode.

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doc/src/sgml/ref/pgupgrade.sgml modified +5 −5

Documentation touched