Update index.html

Author: annevk

Diff for: index.html

@@ -1540,8 +1540,8 @@ <h2>
         };
       </pre>
       <p>
-        {{PushMessageData}} objects have an associated <dfn data-dfn-for="PushMessageData">bytes</dfn> (a [=byte sequence=]),
-        which is set on creation.
+        {{PushMessageData}} objects have an associated <dfn data-dfn-for=
+        "PushMessageData">bytes</dfn> (a [=byte sequence=]), which is set on creation.
       </p>
       <p>
         The <dfn>arrayBuffer()</dfn> method steps are to return an {{ArrayBuffer}} whose contents