update the quotes

foundations/quickstart.ipynb

@@ -426,7 +426,7 @@
    "source": [
     "### Dictionaries (`dict`)\n",
     "\n",
-    "A dictionary is a collection of *labeled objects*. While a list is an *ordered* container, the dictionary is an *unordered* one, meaning that the elements in the container do not presume the order. Dictionary elements are accessed via their "key" rather than their index. Python uses curly braces `{}` to create dictionaries:"
+    "A dictionary is a collection of *labeled objects*. While a list is an *ordered* container, the dictionary is an *unordered* one, meaning that the elements in the container do not presume the order. Dictionary elements are accessed via their \"key\" rather than their index. Python uses curly braces `{}` to create dictionaries:"
    ]
   },
   {