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doc: mention GROUP BY columns can reference target col numbers

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`@@ -131,6 +131,9 @@ TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ]`
`131`	`131`	`eliminates groups that do not satisfy the given condition. (See`
`132`	`132`	`<xref linkend="sql-groupby"/> and`
`133`	`133`	`<xref linkend="sql-having"/> below.)`
	`134`	`+ Although query output columns are nominally computed in the next`
	`135`	`+ step, they can also be referenced (by name or ordinal number)`
	`136`	`+ in the <literal>GROUP BY</literal> clause.`
`134`	`137`	`</para>`
`135`	`138`	`</listitem>`
`136`	`139`

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