Updated example to new syntax

Author: Alexander März

examples/boston_housing_example_Gamma.ipynb

@@ -85,7 +85,9 @@
     "# Specifies Gamma distribution with softplus response function and option to stabilize Gradient/Hessian. See ?Gamma for an overview.\n",
     "lgblss = LightGBMLSS(\n",
     "    Gamma(stabilization=\"None\",   # Options are \"None\", \"MAD\", \"L2\".\n",
-    "          response_fn=\"softplus\") # Function to transform the concentration and rate parameters, e.g., \"exp\" or \"softplus\".\n",
+    "          response_fn=\"softplus\", # Function to transform the concentration and rate parameters, e.g., \"exp\" or \"softplus\".\n",
+    "          loss_fn=\"nll\"           # Loss function. Options are \"nll\" (negative log-likelihood) or \"crps\"(continuous ranked probability score).\n",
+    "         ) \n",
     ")"
    ]
   },