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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
`@@ -5510,6 +5510,17 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i`
`5510`	`5510`	`</tgroup>`
`5511`	`5511`	`</table>`
`5512`	`5512`
	`5513`	`+ <warning>`
	`5514`	`+ <para>`
	`5515`	`+ Using <function>pg_stat_reset()</function> also resets counters that`
	`5516`	`+ autovacuum uses to determine when to trigger a vacuum or an analyze.`
	`5517`	`+ Resetting these counters can cause autovacuum to not perform necessary`
	`5518`	`+ work, which can cause problems such as table bloat or out-dated`
	`5519`	`+ table statistics. A database-wide <command>ANALYZE</command> is`
	`5520`	`+ recommended after the statistics have been reset.`
	`5521`	`+ </para>`
	`5522`	`+ </warning>`
	`5523`	`+`
`5513`	`5524`	`<para>`
`5514`	`5525`	`<function>pg_stat_get_activity</function>, the underlying function of`
`5515`	`5526`	`the <structname>pg_stat_activity</structname> view, returns a set of records`

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