Fix artifact from rebasing

Author: domfarolino

cssom-1/Overview.bs

@@ -1204,8 +1204,8 @@ To <dfn export>fetch a CSS style sheet</dfn> with parsed URL <var>parsed URL</va
 ### The {{LinkStyle}} Interface ### {#the-linkstyle-interface}
 
 The <dfn export>associated CSS style sheet</dfn> of a node is the <a>CSS style sheet</a> in the list of
-<a>document CSS style sheets</a> of which the <a for=CSSStyleSheet>owner node</a> is said node. This node
-must also implement the {{LinkStyle}} interface.
+<a>document or shadow root CSS style sheets</a> of which the <a for=CSSStyleSheet>owner node</a> is said node.
+This node must also implement the {{LinkStyle}} interface.
 
 <pre class=idl>
 interface mixin LinkStyle {