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Doc: correct aggressive vacuum threshold for multixact members storage
The threshold is two billion members, which was interpreted as 2GBin the documentation. Fix to reflect that each member takes up fivebytes, which translates to about 10GB. This is not exact, because ofpage boundaries. While at it, mention the maximum size 20GB.This has been wrong since commitc552e17, so backpatch toversion 14.Author: Alex Friedman <alexf01@gmail.com>Reviewed-by: Sami Imseih <samimseih@gmail.com>Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>Discussion:https://postgr.es/m/CACbFw60UOk6fCC02KsyT3OfU9Dnuq5roYxdw2aFisiN_p1L0bg@mail.gmail.comBackpatch-through: 141 parent5f8eb25 commitfcabc3a
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