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Clarify description of covering indexes in release notes

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Original file line number	Diff line number	Diff line change
`@@ -425,7 +425,8 @@`
`425`	`425`	`</para>`
`426`	`426`
`427`	`427`	`<para>`
`428`		`- This is often called "index-only scans" or "covering indexes".`
	`428`	`+ This is often called "index-only scans", a feature which now enables`
	`429`	`+ the use of indexes with additional columns, or "covering indexes".`
`429`	`430`	`This is possible for heap pages with exclusively all-visible`
`430`	`431`	`tuples, as reported by the visibility map. The visibility map was`
`431`	`432`	`made crash-safe as a necessary part of implementing this feature.`

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