Export element contents definition

Author: khushalsagar

css-contain-2/Overview.bs

@@ -1581,7 +1581,7 @@ Suppressing An Element's Contents Entirely: the 'content-visibility' property {#
 		[=style containment=],
 		[=paint containment=],
 		and [=size containment=].
-		Further, its <dfn noexport id="element-contents">contents</dfn>
+		Further, its <dfn export lt="element contents" id="element-contents">contents</dfn>
 		(the [=flat tree=] descendants of the element,
 		including both text and elements,
 		or the replaced content of a [=replaced element=])