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doc: document the need to analyze partitioned tables

Autovacuum does not do it.Reported-by: Justin PryzbyDiscussion:https://postgr.es/m/20210913035409.GA10647@telsasoft.comBackpatch-through: 11

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`@@ -861,10 +861,15 @@ analyze threshold = analyze base threshold + analyze scale factor * number of tu`
`861`	`861`	`</para>`
`862`	`862`
`863`	`863`	`<para>`
`864`		`- Partitioned tables are not processed by autovacuum. Statistics`
`865`		`- should be collected by running a manual <command>ANALYZE</command> when it is`
`866`		`- first populated, and again whenever the distribution of data in its`
`867`		`- partitions changes significantly.`
	`864`	`+ Partitioned tables do not directly store tuples and consequently`
	`865`	`+ are not processed by autovacuum. (Autovacuum does process table`
	`866`	`+ partitions just like other tables.) Unfortunately, this means that`
	`867`	`+ autovacuum does not run <command>ANALYZE</command> on partitioned`
	`868`	`+ tables, and this can cause suboptimal plans for queries that reference`
	`869`	`+ partitioned table statistics. You can work around this problem by`
	`870`	`+ manually running <command>ANALYZE</command> on partitioned tables`
	`871`	`+ when they are first populated, and again whenever the distribution`
	`872`	`+ of data in their partitions changes significantly.`
`868`	`873`	`</para>`
`869`	`874`
`870`	`875`	`<para>`

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