Fix breaking newline

examples/Index.ipynb

@@ -18,8 +18,7 b''
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This directory contains IPython's notebook-based documentation. This
-    augments our [Sphinx-based documentation](https://ipython.org/ipython-doc/stable/index.html) with notebooks that contain interactive tutorials and examples. Over time, more of our documentation will be pulled into this format."
+    "This directory contains IPython's notebook-based documentation. This augments our [Sphinx-based documentation](https://ipython.org/ipython-doc/stable/index.html) with notebooks that contain interactive tutorials and examples. Over time, more of our documentation will be pulled into this format."
    ]
   },
   {