[css-inline] per working group resolution, initial letter is undefined for ruby

Author: dauwhe

css-inline/Overview.bs

@@ -499,10 +499,11 @@ Creating Initial Letters: the 'initial-letter' property</h3>
 		<pre>p::first-letter { initial-letter: 2; }</pre>
 	</div>
 
-	Issue: Define interaction with <a>ruby</a>. Easiest is to make it not apply to/within <a>ruby</a>.
-
 	The 'initial-letter' property does not apply to boxes
-	that are not positioned at the start of the line due to bidi reordering.
+	that are not positioned at the start of the line due to bidi reordering. 
+	
+	The 'initial-letter' property is undefined on children of <a>ruby</a> base container boxes 
+	and on <a>ruby</a> container boxes. 
 
 <h4 id="initial-letter-properties">
 Properties</h4>