pgsql: pg_upgrade: document use of file system and COW snapshots

pg_upgrade: document use of file system and COW snapshots

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/bcec58cf1ebf20ea237be042d3ef774f887557a9

Modified Files
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doc/src/sgml/pgupgrade.sgml | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

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