[css-ruby] Update note

Author: frivoal

css-ruby-1/Overview.bs

@@ -986,8 +986,8 @@ Line Spacing</h3>
 
 	Note: More control over how ruby affects alignment and line layout
 	will be part of the CSS Line Layout Module Level 3.
-	Note, it is currently in the process of being rewritten;
-	the current drafts should not be relied upon.
+	Note, it is currently in the exploratory stages of development;
+	descriptions of new features should not yet be relied upon.
 
 <h2 id="ruby-props">
 Ruby Formatting Properties</h2>