Fix reference to transfer[-receiving] steps

Some previous copypasta in the definition of [Transferable] mentioned serialization instead of transfer in one place.

Author: littledan

source

@@ -8180,7 +8180,7 @@ interface <dfn>DOMStringList</dfn> {
   arguments, and must not appear on anything other than an interface. It must appear only once on an
   interface. It must not be used on a callback interface. If it appears on a partial interface or an
   interface that is really a mixin, then it must also appear on the original or mixed-in-to
-  interface, and any supplied <span>serialization steps</span> and <span>deserialization
+  interface, and any supplied <span>transfer steps</span> and <span>transfer-receiving
   steps</span> for the partial interface or mixin should be understood as being appended to those of
   the original or mixed-in-to interface.</p>