Make the example use dpi for the printer-quality version.

--HG--
extra : rebase_source : d835230b6f3923111846a03bdaea84f8124b9b7c

Author: tabatkins

css4-images/Overview.html

@@ -881,15 +881,15 @@ <h3 id=image-set-notation><span class=secno>4.3. </span> Resolution
   <div class=example>
    <p> This example shows how to use ‘<code class=css>image-set()</code>’
     to provide an image in three versions: a "normal" version, a "high-res"
-    version, and an extra-high resolution version for use in printing (as
-    printers can have <em>extremely</em> high resolution):
+    version, and an extra-high resolution version for use in high-quality
+    printing (as printers can have <em>extremely</em> high resolution):
 
    <pre><!--
 		-->background-image: image-set( "foo.png" 1x,
 <!--
 		-->                             "foo-2x.png" 2x,
 <!--
-		-->                             "foo-print.png" 10x );</pre>
+		-->                             "foo-print.png" 600dpi );</pre>
   </div>
   <!--
 EEEEEEEEEEEEEEEEEEEEEElllllll                                                                                            tttt          

css4-images/Overview.src.html

@@ -593,13 +593,13 @@ <h3 id='image-set-notation'>
 			This example shows how to use ''image-set()'' to provide an image in three versions:
 			a "normal" version,
 			a "high-res" version,
-			and an extra-high resolution version for use in printing
+			and an extra-high resolution version for use in high-quality printing
 			(as printers can have <em>extremely</em> high resolution):
 
 		<pre><!--
 		-->background-image: image-set( "foo.png" 1x,&#xa;<!--
 		-->                             "foo-2x.png" 2x,&#xa;<!--
-		-->                             "foo-print.png" 10x );</pre>
+		-->                             "foo-print.png" 600dpi );</pre>
 	</div>