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Update documentation for tsvector duplicate elimination:

! Duplicate positions for the same lexeme are discarded.

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Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.222 2008/01/02 19:53:13 mha Exp $ -->`
	`1`	`+<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.223 2008/01/12 21:51:36 momjian Exp $ -->`
`2`	`2`
`3`	`3`	`<chapter id="datatype">`
`4`	`4`	`<title id="datatype-title">Data Types</title>`
`@@ -3330,7 +3330,7 @@ SELECT 'a:1 fat:2 cat:3 sat:4 on:5 a:6 mat:7 and:8 ate:9 a:10 fat:11 rat:12'::ts`
`3330`	`3330`	`document. Positional information can be used for`
`3331`	`3331`	`<firstterm>proximity ranking</firstterm>. Position values can`
`3332`	`3332`	`range from 1 to 16383; larger numbers are silently clamped to 16383.`
`3333`		`- Duplicateposition entries are discarded.`
	`3333`	`+ Duplicatepositions for the same lexeme are discarded.`
`3334`	`3334`	`</para>`
`3335`	`3335`
`3336`	`3336`	`<para>`

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