Commit832c095

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Update documentation to state there is three-value logic, not

three-value boolean logic.Backpatch to 9.0.X since we just got another bug report about thistoday.

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Original file line number	Diff line number	Diff line change
`@@ -82,8 +82,9 @@`
`82`	`82`	`<member><literal>NOT</></member>`
`83`	`83`	`</simplelist>`
`84`	`84`
`85`		`- <acronym>SQL</acronym> uses a three-valued Boolean logic where the null value represents`
`86`		`- <quote>unknown</quote>. Observe the following truth tables:`
	`85`	`+ <acronym>SQL</acronym> uses a three-valued logic system with true,`
	`86`	`+ false, and <literal>null</>, which represents <quote>unknown</quote>.`
	`87`	`+ Observe the following truth tables:`
`87`	`88`
`88`	`89`	`<informaltable>`
`89`	`90`	`<tgroup cols="4">`

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