[css-conditional] split security & privacy as required by new wide review

Author: svgeesus

css-conditional-3/Overview.bs

@@ -686,10 +686,12 @@ partial namespace CSS {
     </div>
 </dl>
 
-<h2 class=no-num id=priv-sec>Privacy and Security Considerations</h2>
+<h2 class=no-num id=security>Security Considerations</h2>
 
 This spec introduces no new security considerations.
 
+<h2 class=no-num id=privacy>Privacy Considerations</h2>
+
 Various features in this specification,
 associated mainly with the ''@media'' rule
 but also to some degree with the ''@supports'' rule,

css-conditional-4/Overview.bs

@@ -318,13 +318,14 @@ An ''@else'' rule that is not part of a <a>conditional rule chain</a> is invalid
 
 </div>
 
-<h2 class=no-num id="priv">Privacy Considerations</h2>
+<h2 class=no-num id="security">Security Considerations</h2>
 
-No Privacy issues have been raised against this document
+No Security issues have been raised against this document
 
-<h2 class=no-num id="sec">Security Considerations</h2>
+<h2 class=no-num id="privacy">Privacy Considerations</h2>
+
+No Privacy issues have been raised against this document
 
-No Security issues have been raised against this document
 
 <h2 class=no-num id="acknowledgments">Acknowledgments</h2>