[css-values] Add an example of using # and {} together.

Author: tabatkins

css-values/Overview.html

@@ -510,7 +510,8 @@ <h3 id=component-multipliers><span class=secno>2.3. </span> Component value
    <li>A hash mark (#) indicates that the preceding type, word, or group
     occurs one or more times, separated by comma tokens. It may optionally be
     followed by the curly brace forms, above, to indicate precisely how many
-    times the repetition occurs.
+    times the repetition occurs, like ‘<code
+    class=css>&lt;length>#{1,4}</code>’.
   </ul>
 
   <p>For repeated component values (indicated by ‘<code

css-values/Overview.src.html

@@ -234,7 +234,8 @@ <h3 id="component-multipliers">
 		<li>A hash mark (#) indicates that the preceding type, word, or
 			group occurs one or more times, separated by comma tokens.
 			It may optionally be followed by the curly brace forms, above,
-			to indicate precisely how many times the repetition occurs.
+			to indicate precisely how many times the repetition occurs,
+			like ''&lt;length>#{1,4}''.
 	</ul>
 
 	<p>For repeated component values (indicated by ''*'', ''+'', or ''#''), UAs must support at least 20 repetitions of the component.  If a property value contains more than the supported number of repetitions, the declaration must be ignored as if it were invalid.</p>