added a note, demo video resize

WebContent/ui/pages/help.html

@@ -27,7 +27,7 @@
 	</li>
 
 	<li><a id="demo">Demo</a>
-	<div><iframe width="420" height="315" src="http://www.youtube.com/embed/pFCJAFvc_MA" frameborder="0" allowfullscreen></iframe></div>
+	<div><iframe width="630" height="470" src="http://www.youtube.com/embed/pFCJAFvc_MA" frameborder="0" allowfullscreen></iframe></div>
 	<li><a id="options">Options description</a>
 
 	<p>You can customize the way SingleFile process a document through the options page. Right-click on SingleFile icon <img src="../resources/icon_19.png" id="icon"> in the Chrome toolbar and select "Options" in the context menu to open the options page.</p>
@@ -124,7 +124,7 @@
 	<p>If you find an unknown issue (i.e. frozen process, extra saved files, blank or altered document, tab crash...):</p>
 	<ul>
 		<li>reset SingleFile options</li>
-		<li>if option reseting did not work, try to uncheck <span class="option">display save notification</span> and <span class="option">display save banner</span> and make sure that <span class="option">process in background</span> is unchecked: you will have to use Chrome "Save as" dialog to save the page.</li>
+		<li>if option reseting did not work, try to uncheck <span class="option">display save notification</span> and <span class="option">display save banner</span> and make sure that <span class="option">process in background</span> is unchecked: you will have to use Chrome "Save as" dialog to save the page (select "Webpage, Complete" type in "Save as" dialog).</li>
 		<li>disable all other extensions to see if there is a conflict</li>
 		<li>if there is a conflict then try to determine against which extension(s)</li>
 		<li>please report the issue <a href="https://github.com/gildas-lormeau/SingleFile/issues">here</a> with a short description describing how to reproduce the issue, Chrome version, OS name and version.</li>