fixed typo

Former-commit-id: a65bd68d1893f4223ee6a8b9e699d8cf758a0ea0

extension/ui/pages/help.html

@@ -353,7 +353,7 @@
 					</li>
 					<li data-options-label="saveToClipboardLabel"> <span class="option">Option: save to clipboard</span>
 						<p>Check this option to copy the page to the clipboard instead of downloading it. Checking this
-							option will force the "file name" option to be disabled.</p>
+							option will force the "file name" options to be disabled.</p>
 						<p class="notice">It is recommended to <u>uncheck</u> this option</p>
 					</li>
 				</ul>