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Doc: improve a couple of comments in postgresql.conf.sample.

Clarify comments associated with max_parallel_workers andrelated settings.Per bug #18343 from Christopher Kline.Discussion:https://postgr.es/m/18343-3a5e903d1d3692ab@postgresql.org

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Original file line number	Diff line number	Diff line change
`@@ -187,9 +187,9 @@`
`187`	`187`	`#effective_io_concurrency = 1# 1-1000; 0 disables prefetching`
`188`	`188`	`#maintenance_io_concurrency = 10# 1-1000; 0 disables prefetching`
`189`	`189`	`#max_worker_processes = 8# (change requires restart)`
`190`		`-#max_parallel_workers_per_gather = 2#taken from max_parallel_workers`
`191`		`-#max_parallel_maintenance_workers = 2#taken from max_parallel_workers`
`192`		`-#max_parallel_workers = 8#maximumnumber of max_worker_processes that`
	`190`	`+#max_parallel_workers_per_gather = 2#limited by max_parallel_workers`
	`191`	`+#max_parallel_maintenance_workers = 2#limited by max_parallel_workers`
	`192`	`+#max_parallel_workers = 8# number of max_worker_processes that`
`193`	`193`	`# can be used in parallel operations`
`194`	`194`	`#parallel_leader_participation = on`
`195`	`195`	`#old_snapshot_threshold = -1# 1min-60d; -1 disables; 0 is immediate`

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