Update lazy_scan_heap header comment.

The previous comment described how things worked in PostgreSQL 8.2
and prior.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/5630eddf1efe7c374fe8e8bdeaba3c70f8cd628b

Modified Files
--------------
src/backend/commands/vacuumlazy.c |   17 +++++++++++------
1 files changed, 11 insertions(+), 6 deletions(-)

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