pgsql: pg_upgrade docs: update docs for 8.3 support removal

pg_upgrade docs: update docs for 8.3 support removal

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e8c81b1b8e51475dd5a787660e6754c4bafbff47

Modified Files
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doc/src/sgml/pgupgrade.sgml | 84 ++-----------------------------------------
1 file changed, 2 insertions(+), 82 deletions(-)

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