Update kotlin-tips.md (#2969)
Update kotlin-tips.md (#2969)

* Update kotlin-tips.md

* update: update kotlin-tips.md

* Update kotlin-tips.md

Co-authored-by: Andrey Polyakov <9f4bf2072f8b677765ab09f044bf5b0e5c8f952e@gmail.com>
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,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn