Update obsolete index scan TID comments.

Peter Geoghegan <pg@bowt.ie>

Commit: 3045324214467dd3f0bef31f6f33562b9eb93aa3
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2024-03-11T22:07:10Z
Releases: 17.0
Update obsolete index scan TID comments.

Oversight in commit c2fe139c20.

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