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Expand comment on how pg_upgrade is turning off autovacuum.

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Original file line number	Diff line number	Diff line change
`@@ -172,7 +172,9 @@ start_postmaster(ClusterInfo *cluster, bool quiet)`
`172`	`172`	`*`
`173`	`173`	`* Using autovacuum=off disables cleanup vacuum and analyze, but`
`174`	`174`	`* freeze vacuums can still happen, so we set`
`175`		`- * autovacuum_freeze_max_age high too.`
	`175`	`+ * autovacuum_freeze_max_age very high. We assume all datfrozenxid and`
	`176`	`+ * relfrozen values are less than a gap of 2000000000 from the current`
	`177`	`+ * xid counter, so autovacuum will not touch them.`
`176`	`178`	`*/`
`177`	`179`	`snprintf(cmd,sizeof(cmd),`
`178`	`180`	`SYSTEMQUOTE"\"%s/pg_ctl\" -l \"%s\" -D \"%s\" "`

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