Minor: Documentation: Fix typo

Author: ywarnier

public/documentation/changelog.html

@@ -204,7 +204,7 @@ <h3>Known issues</h3>
         <li>Some features that were present in 1.11.x have not been checked or re-implemented in 2.0 yet. Our goal is to cover 1.11.x functionally by v2.1 a few months after 2.0. The most used features are all there, though.</li>
         <li>The portfolio tool is not yet entirely functional.</li>
         <li>Some minor issues are still affecting this version and we are working on them to get them solved by the stable release.</li>
-        <li>If a directory in the documents tool was given the name of one of the system folders (Images, Videos, Flash, Audio) in Chamilo 1.11.x, it will be considered a 'media_folder', meaning it will not be visible anymore unless the 'show_default_folders' setting is set to 'true' globally. To avoid this, you could rename the folder before the upgrade. New systems installed from 2.0 are not affected.</li>
+        <li>If a directory in the documents tool was given the name of one of the system folders (Images, Video, Flash, Audio) in Chamilo 1.11.x, it will be considered a 'media_folder', meaning it will not be visible anymore unless the 'show_default_folders' setting is set to 'true' globally. To avoid this, you could rename the folder before the upgrade. New systems installed from 2.0 are not affected.</li>
     </ul>
 
     <a id="2.0-rc.1"></a>