doc: Update formula for vacuum insert threshold.

Nathan Bossart <nathan@postgresql.org>

Commit: cbdce71b9984e9bb2d8b3a4a8de466cbb2c32ea7
Author: Nathan Bossart <nathan@postgresql.org>
Date: 2025-11-19T16:01:37Z
doc: Update formula for vacuum insert threshold.

Oversight in commit 06eae9e621.

Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
Discussion: https://postgr.es/m/aRODeqFUVkGDJSPP%40nathan
Backpatch-through: 18

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doc/src/sgml/maintenance.sgml modified +7 −3

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