Minor fixes to doc and spelling

Author: alancutter

docs/extension-api.md

@@ -53,7 +53,7 @@ WebAnimationsPolyfillExtension.register({
       },
     },
   },
-  applyHook: function(values, style) {
+  applyHook: function(values) {
     var heat = values.heat;
     if (heat == undefined) {
       return null;

src/extension-api.js

@@ -65,7 +65,7 @@
     // extension API and avoid this format conversion function.
     function merge(start, end) {
       var result = params.merge(start, end);
-      return [result.start, result.end, result.serialise];
+      return [result.start, result.end, result.serialize];
     }
     scope.addPropertyHandler(params.parse, merge, property);
   }