nbtree: Tweak _bt_pgaddtup() comments.

Peter Geoghegan <pg@bowt.ie>

Commit: 2110f716965fe1ac5af83380aa108541b1457e0d
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2019-11-18T21:04:53Z
Releases: 13.0
nbtree: Tweak _bt_pgaddtup() comments.

Make it clear that _bt_pgaddtup() truncates the first data item on an
internal page because its key is supposed to be treated as minus
infinity within _bt_compare().

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