Fix thinko in comment

It was confusing symlinks with hard links.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/34c02044ed7e7defde5a853b26dcd806c872d974

Modified Files
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contrib/pg_upgrade/file.c |    4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

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