Remove instruction to add line nrs from author guidelines

submissions/templates/submissions/author_guidelines.html

@@ -47,7 +47,6 @@
       <li>use 10pt font size</li>
       <li>include the DOI in your citations (using the <em>doi</em> package)</li>
       <li>to ease navigation within your text, use hyperlinking for your equations and references (using the <em>hyperref</em> package)</li>
-      <li>include line numbering for easier feedback (using the <em>lineno</em> package)</li>
     </ul>
     <p>Including the DOI is particularly important: the paper can only be published if references are externally linked.</p>
   </p>