Update 404.html

Author: nicolaskruchten

404.html

@@ -79,7 +79,7 @@
                         <h3>Plot twist!</h3>
                         <br />
                         <h5>There's nothing here...</h5><br />
-                        <h5> <a href="https://plot.ly/graphing-libraries">Back to Graphing Libraries documentatino</a></h5>
+                        <h5> <a href="https://plot.ly/graphing-libraries">Back to Graphing Libraries documentation</a></h5>
                     </div>
                 </div>