[css-inline] add rendering to example of when initial-letters is applied

Author: dauwhe

css-inline-3/Overview.bs

@@ -756,10 +756,10 @@ Applicability</h4>
 
 		The result might be rendered as
 
-		<pre>
-			[ADD RENDERING HERE]
-			THIS PHRASE IS STYLED specially. &hellip;
-		</pre>
+			<figure>
+				<img src="images/first-most-inline-level-descendant-example.png" width="300"
+		     alt="text with two-line initial-letter">
+			</figure>
 
 		(Note that the styling on <code>&lt;b></code>
 		is ignored,