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Revert "Correct WAL space calculation formula in docs."

This reverts commit915116b.Per discussion, the previous formula was in fact correct.http://archives.postgresql.org/pgsql-docs/2010-10/msg00038.php

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Original file line number	Diff line number	Diff line change
`@@ -481,9 +481,9 @@`
`481`	`481`
`482`	`482`	`<para>`
`483`	`483`	`There will always be at least one WAL segment file, and will normally`
`484`		`- not be morefilesthanthe higher of <xref linkend="guc-wal-keep-segments"> or`
`485`		`-(2 +<varname>checkpoint_completion_target</varname>) * <varname>checkpoint_segments</varname> + 1.`
`486`		`- Each segment file is normally 16 MB (though this size can be`
	`484`	`+ not be more than(2 + <varname>checkpoint_completion_target</varname>) * <varname>checkpoint_segments</varname> + 1`
	`485`	`+or<varname>checkpoint_segments</> + <xref linkend="guc-wal-keep-segments"> + 1`
	`486`	`+files.Each segment file is normally 16 MB (though this size can be`
`487`	`487`	`altered when building the server). You can use this to estimate space`
`488`	`488`	`requirements for <acronym>WAL</acronym>.`
`489`	`489`	`Ordinarily, when old log segment files are no longer needed, they`

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