pg_upgrade: document use of file system and COW snapshots

Bruce Momjian <bruce@momjian.us>

Commit: bcec58cf1ebf20ea237be042d3ef774f887557a9
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-02-13T03:07:03Z
Releases: 9.4.0
pg_upgrade: document use of file system and COW snapshots

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doc/src/sgml/pgupgrade.sgml modified +4 −1