Fix broken link in docs/index.md.
@@ -90,4 +90,4 @@ checkpointing to snapshotting, various forms of logging, and other low-level
computations. For more information on these components, as well as the structure
described above, see our more detailed discussion of Acme
[components](components.md) or take a look at the full implementations of
-various [agents](../agents/).
+various [agents](../acme/agents/).
