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Doc: add information about partition locking

The documentation around locking of partitions for the executor startupphase of run-time partition pruning wasn't clear about which partitionswere being locked. Fix that.Reviewed-by: Tender Wang <tndrwang@gmail.com>Discussion:https://postgr.es/m/CAApHDvp738G75HfkKcfXaf3a8s%3D6mmtOLh46tMD0D2hAo1UCzA%40mail.gmail.comBackpatch-through: 13

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Original file line number	Diff line number	Diff line change
`@@ -4698,7 +4698,9 @@ EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2008-01-01';`
`4698`	`4698`	`It is possible to determine the number of partitions which were`
`4699`	`4699`	`removed during this phase by observing the`
`4700`	`4700`	`<quote>Subplans Removed</quote> property in the`
`4701`		`- <command>EXPLAIN</command> output.`
	`4701`	`+ <command>EXPLAIN</command> output. It's important to note that any`
	`4702`	`+ partitions removed by the partition pruning done at this stage are`
	`4703`	`+ still locked at the beginning of execution.`
`4702`	`4704`	`</para>`
`4703`	`4705`	`</listitem>`
`4704`	`4706`

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