[css-inline] add line-height to properties that don't apply to initial-letter, w3c#2700

Author: dauwhe

css-inline-3/Overview.bs

@@ -576,7 +576,8 @@ Properties</h4>
 	also apply to an <a>initial letter</a> 
 	(unless it is an <a>atomic inline</a>,
 	in which case the set of properties that apply to an <a>atomic inline</a> apply)
-	except for 'vertical-align' and its <a>sub-properties</a>.
+	except for 'vertical-align' and its <a>sub-properties</a>,
+	and 'line-height'.
 	<!-- Basically, any properties defined in css-inline
 	except those specific to initial letters,
 	so keep this list updated as we add things to this spec. -->