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doc: warn pg_stat_reset() can cause vacuum/analyze problems

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Original file line number	Diff line number	Diff line change
`@@ -5475,6 +5475,17 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i`
`5475`	`5475`	`</tgroup>`
`5476`	`5476`	`</table>`
`5477`	`5477`
	`5478`	`+ <warning>`
	`5479`	`+ <para>`
	`5480`	`+ Using <function>pg_stat_reset()</function> also resets counters that`
	`5481`	`+ autovacuum uses to determine when to trigger a vacuum or an analyze.`
	`5482`	`+ Resetting these counters can cause autovacuum to not perform necessary`
	`5483`	`+ work, which can cause problems such as table bloat or out-dated`
	`5484`	`+ table statistics. A database-wide <command>ANALYZE</command> is`
	`5485`	`+ recommended after the statistics have been reset.`
	`5486`	`+ </para>`
	`5487`	`+ </warning>`
	`5488`	`+`
`5478`	`5489`	`<para>`
`5479`	`5490`	`<function>pg_stat_get_activity</function>, the underlying function of`
`5480`	`5491`	`the <structname>pg_stat_activity</structname> view, returns a set of records`

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