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

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`@@ -4728,6 +4728,17 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i`
`4728`	`4728`	`</tgroup>`
`4729`	`4729`	`</table>`
`4730`	`4730`
	`4731`	`+ <warning>`
	`4732`	`+ <para>`
	`4733`	`+ Using <function>pg_stat_reset()</function> also resets counters that`
	`4734`	`+ autovacuum uses to determine when to trigger a vacuum or an analyze.`
	`4735`	`+ Resetting these counters can cause autovacuum to not perform necessary`
	`4736`	`+ work, which can cause problems such as table bloat or out-dated`
	`4737`	`+ table statistics. A database-wide <command>ANALYZE</command> is`
	`4738`	`+ recommended after the statistics have been reset.`
	`4739`	`+ </para>`
	`4740`	`+ </warning>`
	`4741`	`+`
`4731`	`4742`	`<para>`
`4732`	`4743`	`<function>pg_stat_get_activity</function>, the underlying function of`
`4733`	`4744`	`the <structname>pg_stat_activity</structname> view, returns a set of records`

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