Fix minor typo in the example notebook. (#39)

examples/notebooks/introduction_enlyze_python_sdk.ipynb

@@ -666,7 +666,7 @@
    "source": [
     "### Variables\n",
     "\n",
-    "The last step we need to make is getting the variables for a machine. We use the `get_variables`method, which always requires the specification of an machine."
+    "The last step we need to make is getting the variables for a machine. We use the `get_variables`method, which always requires the specification of a machine."
    ]
   },
   {