Adds Slicing reflection notes

Author: craigsdennis

Introduction to NumPy.ipynb

@@ -1015,6 +1015,17 @@
     "study_minutes[2]"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Slicing\n",
+    "* Works a lot like normal list slicing.\n",
+    "* You can use commas to separate each dimension slice.\n",
+    "* Always returns a data view **not a copy**\n",
+    "* You can access the base object using the `ndarray.base` property"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 55,