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In pg_upgrade, add C comment about how autovacuum is disabled.

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Original file line number	Diff line number	Diff line change
`@@ -169,7 +169,11 @@ start_postmaster(ClusterInfo *cluster, bool quiet)`
`169`	`169`	`* same file because we get the error: "The process cannot access the file`
`170`	`170`	`* because it is being used by another process." so we have to send all`
`171`	`171`	`* other output to 'nul'.`
`172`		`- */`
	`172`	`+ *`
	`173`	`+ * Using autovacuum=off disables cleanup vacuum and analyze, but`
	`174`	`+ * freeze vacuums can still happen, so we set`
	`175`	`+ * autovacuum_freeze_max_age high too.`
	`176`	`+ */`
`173`	`177`	`snprintf(cmd,sizeof(cmd),`
`174`	`178`	`SYSTEMQUOTE"\"%s/pg_ctl\" -l \"%s\" -D \"%s\" "`
`175`	`179`	`"-o \"-p %d -c autovacuum=off "`

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