[css-cascade][editorial] Don't globally define productions in the @import definition.

Author: fantasai

css-cascade-4/Overview.bs

@@ -224,11 +224,11 @@ Conditional ''@import'' Rules</h3>
 		</pre>
 	</div>
 
-	A <dfn><<media-query>></dfn> corresponds to the <code>media_query_list</code> production
+	A <dfn noexport for="@import"><<media-query>></dfn> corresponds to the <code>media_query_list</code> production
 	and is interpreted as a <a>media query</a>,
-	and a <dfn><<supports-condition>></dfn> corresponds to a <code>supports_condition</code> production
+	and a <dfn noexport for="@import"><<supports-condition>></dfn> corresponds to a <code>supports_condition</code> production
 	and is interpreted as an ''@supports'' condition.
-	If a <dfn><<declaration>></dfn> (a <code>declaration</code> production) is given in place of a <<supports-condition>>,
+	If a <dfn noexport for="@import"><<declaration>></dfn> (a <code>declaration</code> production) is given in place of a <<supports-condition>>,
 	it must be interpreted as a <code>supports_declaration_condition</code> production
 	(i.e. the extra set of parentheses is implied)
 	and treated as a <<supports-condition>>.

css-cascade-5/Overview.bs

@@ -222,11 +222,11 @@ Conditional ''@import'' Rules</h3>
 		</pre>
 	</div>
 
-	A <dfn><<media-query>></dfn> corresponds to the <code>media_query_list</code> production
+	A <dfn noexport for="@import"><<media-query>></dfn> corresponds to the <code>media_query_list</code> production
 	and is interpreted as a <a>media query</a>,
-	and a <dfn><<supports-condition>></dfn> corresponds to a <code>supports_condition</code> production
+	and a <dfn noexport for="@import"><<supports-condition>></dfn> corresponds to a <code>supports_condition</code> production
 	and is interpreted as an ''@supports'' condition.
-	If a <dfn><<declaration>></dfn> (a <code>declaration</code> production) is given in place of a <<supports-condition>>,
+	If a <dfn noexport for="@import"><<declaration>></dfn> (a <code>declaration</code> production) is given in place of a <<supports-condition>>,
 	it must be interpreted as a <code>supports_declaration_condition</code> production
 	(i.e. the extra set of parentheses is implied)
 	and treated as a <<supports-condition>>.