eta-expansion.md: Fix link

Author: smarter

docs/docs/reference/changed/eta-expansion.md

@@ -35,7 +35,7 @@ will be deprecated).
 The reason for excluding nullary methods from automatic eta expansion
 is that Scala implicitly inserts the `()` argument, which would
 conflict with eta expansion. Automatic `()` insertion is
-[limited](auto-apply.md) in Dotty, but the fundamental ambiguity
+[limited](../dropped/auto-apply.md) in Dotty, but the fundamental ambiguity
 remains.
 
 ### Reference