Fix link to Ray in autotune tutorial (#130)

Author: martinkim0

autotune_scvi.ipynb

@@ -356,7 +356,7 @@
             "cell_type": "markdown",
             "metadata": {},
             "source": [
-                "Now that we know what hyperparameters are available to us, we can define a search space using the [search space API](https://docs.ray.io/en/latest/tune/api_docs/search_space.html) in `ray.tune`. For this tutorial, we choose a simple search space with two model hyperparameters and one training plan hyperparameter. These can all be combined into a single dictionary that we pass into the `fit` method."
+                "Now that we know what hyperparameters are available to us, we can define a search space using the [search space API](https://docs.ray.io/en/latest/tune/api/search_space.html) in `ray.tune`. For this tutorial, we choose a simple search space with two model hyperparameters and one training plan hyperparameter. These can all be combined into a single dictionary that we pass into the `fit` method."
             ]
         },
         {
@@ -602,4 +602,4 @@
     },
     "nbformat": 4,
     "nbformat_minor": 2
-}
+}