Adjust lazy_scan_heap() accounting comments.

Peter Geoghegan <pg@bowt.ie>

Commit: 7cde6b13a9b630e2f04d91e2f17dedc2afee21c6
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2021-02-15T03:28:37Z
Releases: 14.0
Adjust lazy_scan_heap() accounting comments.

Explain which particular LP_DEAD line pointers get accounted for by the
tups_vacuumed variable.

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