pgsql: pg_upgrade: mention the need for tablespace snapshots in docs

pg_upgrade: mention the need for tablespace snapshots in docs

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/3f735ae831d3c249378280050b104ff751dfc668

Modified Files
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doc/src/sgml/pgupgrade.sgml | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

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