chore: add links to Any, Nothing, and Unit types (#4253)

* chore: add links to Any, Nothing, and Unit types

* chore: update the links

Author: koshachy

docs/topics/basic-types.md

@@ -5,12 +5,19 @@ While certain types have an optimized internal representation as primitive value
 they appear and behave like regular classes to you.
 
 This section describes the basic types used in Kotlin:
+
 * [Numbers](numbers.md) and their [unsigned counterparts](unsigned-integer-types.md)
 * [Booleans](booleans.md)
 * [Characters](characters.md)
 * [Strings](strings.md)
 * [Arrays](arrays.md)
 
 > [Learn how to perform type checks and casts in Kotlin](typecasts.md).
-> 
-{type="tip"}
+>
+{type="tip"}
+
+To learn about other Kotlin types, such as `Nothing`, `Any`, and `Unit`, look through the Kotlin API reference:
+
+* [`Any`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/)
+* [`Nothing`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-nothing.html)
+* [`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/)