Update Aggregators.ipynb

Fix minor typos

Author: WillieMaddox

Part 2/Section 08 - Iteration Tools/01 - Aggregators/Aggregators.ipynb

@@ -437,7 +437,7 @@
    "source": [
     "The `all` function is very similar to the `any` function, but it determines if **all** the elements of the iterable are truthy.\n",
     "\n",
-    "Basically it is equivalent to doing an `and` between all the elements oif the iterable and casting the result to a Boolean."
+    "Basically it is equivalent to doing an `and` between all the elements of the iterable and casting the result to a Boolean."
    ]
   },
   {
@@ -768,7 +768,7 @@
    ]
   },
   {
-   "cell_type": "raw",
+   "cell_type": "markdown",
    "metadata": {},
    "source": [
     "Still this is clunky - there has to be a better way!\n",
@@ -854,7 +854,7 @@
    "outputs": [],
    "source": [
     "def is_number(x):\n",
-    "    return is_instance(x, Number)"
+    "    return isinstance(x, Number)"
    ]
   },
   {