[receiver/mysql] fix error message for scrapeStatementEventsStats (#3…

…4152)

**Description:** 
Fix what looks like a copy/paste of the error message from another
method.

**Link to tracking Issue:**
n.a.

**Testing:**
n.a.

**Documentation:**
n.a.

receiver/mysqlreceiver/scraper.go

@@ -500,7 +500,7 @@ func (m *mySQLScraper) scrapeIndexIoWaitsStats(now pcommon.Timestamp, errs *scra
 func (m *mySQLScraper) scrapeStatementEventsStats(now pcommon.Timestamp, errs *scrapererror.ScrapeErrors) {
 	statementEventsStats, err := m.sqlclient.getStatementEventsStats()
 	if err != nil {
-		m.logger.Error("Failed to fetch index io_waits stats", zap.Error(err))
+		m.logger.Error("Failed to fetch statement events stats", zap.Error(err))
 		errs.AddPartial(8, err)
 		return
 	}