updated help and README

Former-commit-id: 6eed626cfdac18814c27991f9b74618e646e09bd

README.MD

@@ -46,6 +46,7 @@ SingleFile can be installed:
    - the current tab,
    - or the unpinned tabs,
    - or all the tabs.
+ - You can interrupt the saving progress by clicking on the SingleFile button when processing a page.
  - With auto-save active, pages are automatically saved every time after being loaded (or before being unloaded if not).
  - Right-click on the SingleFile button and select "Options"/"Manage extension" to open the options page.
  - The default save folder is the download folder configured in your browser, cf. about:preferences in Firefox and chrome://settings in Chrome.

extension/ui/pages/help.html

@@ -52,6 +52,8 @@
 							<li>or all the tabs.</li>
 						</ul>
 					</li>
+					<li>You can interrupt the saving progress by clicking on the SingleFile button when processing a
+						page.</li>
 					<li>With auto-save active, pages are automatically saved every time after being loaded (or before
 						being unloaded if not). </li>
 					<li>Right-click on the SingleFile button and select "Options" to open the options page.</li>