x/website: first example of race_detector doc does not work for newest versions

[dvordrova]

https://go.dev/doc/articles/race_detector

So this example with loop variable

func main() {
	var wg sync.WaitGroup
	wg.Add(5)
	for i := 0; i < 5; i++ {
		go func() {
			fmt.Println(i) // Not the 'i' you are looking for.
			wg.Done()
		}()
	}
	wg.Wait()
}

Should it have note with a link on loopvar-preview page?

Or should it be added new example like

func main() {
	var wg sync.WaitGroup
	wg.Add(5)
	var i int
	for i = 0; i < 5; i++ {
		go func() {
			fmt.Println(i) // Not the 'i' you are looking for.
			wg.Done()
		}()
	}
	wg.Wait()
}

[dmitshur]

Thanks for reporting.

CC @dvyukov, @ianlancetaylor.

[gopherbot]

Change https://go.dev/cl/610975 mentions this issue: doc/articles/race_detector: update for Go 1.22 loop variable changes