doc: Update formula for vacuum insert threshold.

Oversight in commit 06eae9e621.

Reviewed-by: Melanie Plageman <[email protected]>
Discussion: https://postgr.es/m/aRODeqFUVkGDJSPP%40nathan
Backpatch-through: 18

Branch
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REL_18_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/c99436f433220d967297b3bb9a8d8c2d1e836abe

Modified Files
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doc/src/sgml/maintenance.sgml | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

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