list REC-XML-NAMES under normative only, not both

Author: fantasai

css3-namespace/Overview.src.html

@@ -230,7 +230,7 @@ <h3 id="prefixes">Declaring Prefixes</h3>
     namespace so declared is the default namespace. The <dfn>default
     namespace</dfn> applies to names that have no explicit namespace prefix.
     Modules that employ namespace prefixes must define in which contexts the
-    default namespace applies. For example, following [[REC-XML-NAMES]], in
+    default namespace applies. For example, following [[!REC-XML-NAMES]], in
     Selectors [[SELECT]] the default namespace applies to type
     selectors&#8212;but it does not apply to attribute selectors. There is no
     default value for the default namespace: modules that assign unqualified