Style & ordering
Style & ordering

* 'Higher-order functions' to the beginning of the page.
* Add a few more links and examples.
* Rephrase a few sentences to look less formal.

JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,meilalina/kotlin-web-site,meilalina/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site,meilalina/kotlin-web-site,meilalina/kotlin-web-site