Update simplecell_arbor.ipynb

Author: pitmonticone

examples/simplecell/simplecell_arbor.ipynb

@@ -561,7 +561,7 @@
    "source": [
     "### Defining eFeatures and objectives\n",
     "\n",
-    "For every response we need to define a set of eFeatures we will use for the fitness calculation later. We have to combine features together into objectives that will be used by the optimalisation algorithm. In this case we will create one objective per feature:"
+    "For every response we need to define a set of eFeatures we will use for the fitness calculation later. We have to combine features together into objectives that will be used by the optimisation algorithm. In this case we will create one objective per feature:"
    ]
   },
   {