Improve formatting of Note 6 in article-edit.html

Added a line break after Note 6 for better formatting.

Author: thiagogq

article-edit.html

@@ -106,7 +106,8 @@
                   <li>Don't use HTML in the article (only Markdown, Twig, and LaTeX/TeX). </li>
                   <li>Don't use: \! \, \: or \; </li>
                 </ul>
-                <i>Note 6</i>: You don't need to write raw LaTeX to create a <b>LaTeX article</b>. Basic Markdown is automatically converted to LaTeX, references become footnotes, images are inserted, and the summary becomes the abstract.<br/>               
+                <i>Note 6</i>: You don't need to write raw LaTeX to create a <b>LaTeX article</b>. Basic Markdown is automatically converted to LaTeX, references become footnotes, images are inserted, and the summary becomes the abstract.<br/>
+                <br/>
                 <i>Note 7</i>: LaTeX articles are not rendered in the preview window.<br/>
               </code></div>
           </details>