fix: when sample (#2165)
fix: when sample (#2165)

The sample uses x for both odd and even checks
where as the even check should be for y as
the else clause could neve be reached and 
it would be strange that x.isEven would mean
that y also is even
hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site