[css-conditional-4] Actual abstract, instead of the Conditional 3 one

Author: svgeesus

css-conditional-4/Overview.bs

@@ -16,10 +16,11 @@ Editor: Chris Lilley, W3C, https://svgees.us/, w3cid 1438
 Abstract: This module contains the features of CSS for conditional processing of parts of
   style sheets, conditioned on capabilities of the processor or the
   document the style sheet is being applied to.  It includes and extends the
-  functionality of CSS level 2 [[!CSS21]], which builds on CSS level 1
-  [[CSS1]].  The main extensions compared to level 2 are allowing nesting of
-  certain at-rules inside ''@media'', and the addition of the ''@supports'' rule for
-  conditional processing.
+  functionality of CSS lConditional 3 [[!css-conditional-3]].
+  The main extensions compared to level 3 are
+  the Generalized Conditional ''@when''
+  and Chained Conditional ''@else'' rules, and
+  the addition of selector and font technology queries to the the ''@supports'' rule.
 Default Highlight: css
 </pre>
 
@@ -38,9 +39,6 @@ It adds extensions to the ''@supports'' rule
 to allow testing for supported selectors
 and supported font technologies.
 
-It also adds generalized conditional rules
-and chained conditional rules.
-
 It also adds an ''@when'' rule,
 which generalizes the concept of a conditional rule.
 Anything you can express in an existing conditional rule
@@ -62,7 +60,7 @@ which immediately follow conditional rules
 and automatically qualify their conditions as you'd expect,
 such that at <em>most one rule</em> in an <a>conditional rule chain</a> is chosen as active.
 
-Issue: In the future, copy the contents of [[css3-conditional]] into this document.
+Issue: In the future, copy the contents of [[css-conditional-3]] into this document.
 
 <h2 id="at-supports-ext">Extensions to the ''@supports'' rule</h2>