In pg_upgrade docs, mention using base backup as part of rsync for
logical replication upgrades.

Backpatch to 9.2.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/c90dcd6d2c76402ce307b0d44958c6ca274f2c39

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

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