fixed typo in example notebook

Author: BuildTools

docs/source/examples/Notebook/What is the Jupyter Notebook.ipynb

@@ -153,7 +153,7 @@
     "\n",
     "**Notebooks can be exported** to different static formats including HTML, reStructeredText, LaTeX, PDF, and slide shows ([reveal.js](http://lab.hakim.se/reveal-js/)) using Jupyter's `nbconvert` utility.\n",
     "\n",
-    "Furthermore, any notebook document available from a **public URL on or GitHub can be shared** via [nbviewer](http://nbviewer.jupyter.org). This service loads the notebook document from the URL and renders it as a static web page. The resulting web page may thus be shared with others **without their needing to install the Jupyter Notebook**."
+    "Furthermore, any notebook document available from a **public URL or on GitHub can be shared** via [nbviewer](http://nbviewer.jupyter.org). This service loads the notebook document from the URL and renders it as a static web page. The resulting web page may thus be shared with others **without their needing to install the Jupyter Notebook**."
    ]
   }
  ],