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Doc: fix grammatical errors for enable_partitionwise_aggregate

Author: Andrew AtkinsonReviewed-by: Ashutosh BapatDiscussion:https://postgr.es/m/CAG6XLEnC%3DEgq0YHRic2kWWDs4xwQnQ_kBA6qhhzAq1-pO_9Tfw%40mail.gmail.comBackpatch-through: 11, where enable_partitionwise_aggregate was added

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Original file line number	Diff line number	Diff line change
`@@ -3992,13 +3992,14 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="`
`3992`	`3992`	`<listitem>`
`3993`	`3993`	`<para>`
`3994`	`3994`	`Enables or disables the query planner's use of partitionwise grouping`
`3995`		`- or aggregation, which allows grouping or aggregation on a partitioned`
`3996`		`- tables performed separately for each partition. If the <literal>GROUP`
`3997`		`- BY</literal> clause does not include the partition keys, only partial`
`3998`		`- aggregation can be performed on a per-partition basis, and`
`3999`		`- finalization must be performed later. Because partitionwise grouping`
`4000`		`- or aggregation can use significantly more CPU time and memory during`
`4001`		`- planning, the default is <literal>off</literal>.`
	`3995`	`+ or aggregation, which allows grouping or aggregation on partitioned`
	`3996`	`+ tables to be performed separately for each partition. If the`
	`3997`	`+ <literal>GROUP BY</literal> clause does not include the partition`
	`3998`	`+ keys, only partial aggregation can be performed on a per-partition`
	`3999`	`+ basis, and finalization must be performed later. Because`
	`4000`	`+ partitionwise grouping or aggregation can use significantly more CPU`
	`4001`	`+ time and memory during planning, the default is`
	`4002`	`+ <literal>off</literal>.`
`4002`	`4003`	`</para>`
`4003`	`4004`	`</listitem>`
`4004`	`4005`	`</varlistentry>`

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