Update api reference url (#462)

Fixes #461

Author: sargunv

README.md

@@ -6,7 +6,7 @@
 [![Download](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx/kotlinx-io-core)](https://central.sonatype.com/artifact/org.jetbrains.kotlinx/kotlinx-io-core/)
 [![Kotlin](https://img.shields.io/badge/kotlin-2.2-blue.svg?logo=kotlin)](http://kotlinlang.org)
 [![TeamCity build](https://img.shields.io/teamcity/build/s/KotlinTools_KotlinxIo_BuildAggregated.svg?server=http%3A%2F%2Fteamcity.jetbrains.com)](https://teamcity.jetbrains.com/viewType.html?buildTypeId=KotlinTools_KotlinxIo_BuildAggregated&guest=1)
-[![KDoc link](https://img.shields.io/badge/API_reference-KDoc-blue)](https://kotlin.github.io/kotlinx-io/)
+[![KDoc link](https://img.shields.io/badge/API_reference-KDoc-blue)](https://kotlinlang.org/api/kotlinx-io/)
 
 A multiplatform Kotlin library providing basic IO primitives. `kotlinx-io` is based on [Okio](https://github.com/square/okio) but does not preserve backward compatibility with it.