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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
`@@ -3088,6 +3088,17 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i`
`3088`	`3088`	`</tgroup>`
`3089`	`3089`	`</table>`
`3090`	`3090`
	`3091`	`+ <warning>`
	`3092`	`+ <para>`
	`3093`	`+ Using <function>pg_stat_reset()</function> also resets counters that`
	`3094`	`+ autovacuum uses to determine when to trigger a vacuum or an analyze.`
	`3095`	`+ Resetting these counters can cause autovacuum to not perform necessary`
	`3096`	`+ work, which can cause problems such as table bloat or out-dated`
	`3097`	`+ table statistics. A database-wide <command>ANALYZE</command> is`
	`3098`	`+ recommended after the statistics have been reset.`
	`3099`	`+ </para>`
	`3100`	`+ </warning>`
	`3101`	`+`
`3091`	`3102`	`<para>`
`3092`	`3103`	`<function>pg_stat_get_activity</function>, the underlying function of`
`3093`	`3104`	`the <structname>pg_stat_activity</> view, returns a set of records`

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