Simplify pg_upgrade C comment about what is preserved.

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=3095643d374ca79e5aa347cefbaebdcf70169386

Modified Files
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contrib/pg_upgrade/pg_upgrade.c |   18 ++++++------------
1 files changed, 6 insertions(+), 12 deletions(-)

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Next:	From: Bruce Momjian	Date: 2011-01-08 03:57:49
	Subject: pgsql: More pg_upgrade relfilenode C comments added.
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	Subject: pgsql: In pg_upgrade,track only one copy of namespace/relname in FileN