[css-ruby-1] Clarify that ruby-position doesn't affect ::first-line, even though it can inherit through it

Author: fantasai

css-ruby-1/Overview.bs

@@ -44,9 +44,9 @@ Module interactions</h3>
 	to support ruby.
 
 	None of the properties in this module apply to the ''::first-line'' or
-	''::first-letter'' pseudo-elements,
-	except for 'ruby-position' which applies to ''::first-line'',
-	inheriting to affect ruby annotations on the first line.
+	''::first-letter'' pseudo-elements;
+	however 'ruby-position' can inherit through ''::first-line'' to affect
+	ruby annotations on the first line.
 
 <h3 id="values">
 Value Definitions</h3>