Fix link in structural-types.md

Author: Sporarum

docs/_docs/reference/changed-features/structural-types.md

@@ -91,7 +91,7 @@ a.applyDynamic("f")(b, c)
 
 Using `Selectable` and [Java reflection](https://www.oracle.com/technical-resources/articles/java/javareflection.html), we can select a member from unrelated classes.
 
-> Before resorting to structural calls with Java reflection one should consider alternatives. For instance, sometimes a more a modular _and_ efficient architecture can be obtained using [type classes](https://docs.scala-lang.org/scala3/book/types-type-classes.html).
+> Before resorting to structural calls with Java reflection one should consider alternatives. For instance, sometimes a more a modular _and_ efficient architecture can be obtained using [type classes](../contextual/type-classes.md).
 
 For example, we would like to provide behavior for both [`FileInputStream`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/FileInputStream.html#%3Cinit%3E(java.io.File)) and [`Channel`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/channels/Channel.html) classes by calling their `close` method, however, these classes are unrelated, i.e. have no common supertype with a `close` method. Therefore, below we define a structural type `Closeable` that defines a `close` method.