fixed typo

extension/ui/pages/help.html

@@ -353,7 +353,7 @@
 									src="../resources/button_note_edit.png" class="icon"></li>
 							<li><code>format the page</code>: enable the button <img
 									src="../resources/button_note_format.png" class="icon"> if the page can be
-								formmatted</li>
+								formatted</li>
 							<li><code>remove elements</code>: enable the button <img src="../resources/button_cut.png"
 									class="icon"></li>
 						</ul>
@@ -707,4 +707,4 @@
 	</div>
 </body>
 
-</html>
+</html>