Clarify description of covering indexes in release notes

Simon Riggs <simon@2ndQuadrant.com>

Commit: 56b62cbd01f2857a1f7e72614922b62148350a75
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2012-06-01T10:35:27Z
Releases: 9.2.0
Clarify description of covering indexes in release notes

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doc/src/sgml/release-9.2.sgml modified +2 −1