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doc: PG 13 relnotes: add duplicate btree optimization details

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Original file line number	Diff line number	Diff line change
`@@ -359,9 +359,9 @@ More efficiently store duplicates in btree indexes (Anastasia Lubennikova, Peter`
`359`	`359`	`</para>`
`360`	`360`
`361`	`361`	`<para>`
`362`		`-This allows efficient btree indexing of low cardinality columns.`
`363`		`-Users upgrading with pg_upgrade will need to use REINDEX to make use of`
`364`		`-this feature.`
	`362`	`+This allows efficient btree indexing of low cardinality columns by storing`
	`363`	`+duplicate keys only once.Users upgrading with pg_upgrade will need to`
	`364`	`+use REINDEX to make use ofthis feature.`
`365`	`365`	`</para>`
`366`	`366`
`367`	`367`	`</listitem>`

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