More pg_upgrade relfilenode C comments added.

Branch
------
master

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=2f657e4d720d08b26234f3b9e40e347f3cc42220

Modified Files
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contrib/pg_upgrade/info.c       |    6 ++++++
contrib/pg_upgrade/pg_upgrade.c |    4 +++-
2 files changed, 9 insertions(+), 1 deletions(-)

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Next:	From: Bruce Momjian	Date: 2011-01-08 04:02:31
	Subject: pgsql: Document why pg_upgrade preserves pg_auth.oid (because theyare
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	Subject: pgsql: Simplify pg_upgrade C comment about what is preserved.