pgsql: pg_upgrade docs: don't use cluster for binary/lib

pg_upgrade docs: don't use cluster for binary/lib
In a few cases, pg_upgrade said old/new cluster location when it meant
old/new Postgres install location, so fix those.
Per private email report

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5691de6c95836e0cef3a2fbb3ce61ce80ddecc69

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

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