Align description about props default between composition/options API (#1707)

* fix missing addition about rawProps

* remove duplicate description about rawProps

Co-authored-by: junichi-chiba <junichi.chiba@atglobal.co.jp>

Author: tanquar

src/guide/components/props.md

@@ -398,8 +398,9 @@ defineProps({
   propE: {
     type: Object,
     // Object or array defaults must be returned from
-    // a factory function
-    default() {
+    // a factory function. The function receives the raw
+    // props received by the component as the argument.
+    default(rawProps) {
       return { message: 'hello' }
     }
   },
@@ -453,7 +454,6 @@ export default {
       // a factory function. The function receives the raw
       // props received by the component as the argument.
       default(rawProps) {
-        // default function receives the raw props object as argument
         return { message: 'hello' }
       }
     },