📝 Fix interceptor codes in READMEs (#1745)

Fixes #1744.

### New Pull Request Checklist

- [x] I have read the
[Documentation](https://pub.dev/documentation/dio/latest/)
- [x] I have searched for a similar pull request in the
[project](https://github.com/cfug/dio/pulls) and found none
- [x] I have updated this branch with the latest `main` branch to avoid
conflicts (via merge from master or rebase)
- [ ] I have added the required tests to prove the fix/feature I'm
adding
- [x] I have updated the documentation (if necessary)
- [x] I have run the tests without failures
- [ ] I have updated the `CHANGELOG.md` in the corresponding package

dio/README-ZH.md

@@ -398,14 +398,14 @@ dio.interceptors.add(
   InterceptorsWrapper(
     onRequest: (RequestOptions options, RequestInterceptorHandler handler) {
       // 如果你想完成请求并返回一些自定义数据，你可以使用 `handler.resolve(response)`。
-      // 如果你想终止请求并触发一个错误,你可以使用 `handler.reject(error)`。
+      // 如果你想终止请求并触发一个错误，你可以使用 `handler.reject(error)`。
       return handler.next(options);
     },
-    onResponse: (Response response, RequestInterceptorHandler handler) {
-      // 如果你想终止请求并触发一个错误,你可以使用 `handler.reject(error)`。
+    onResponse: (Response response, ResponseInterceptorHandler handler) {
+      // 如果你想终止请求并触发一个错误，你可以使用 `handler.reject(error)`。
       return handler.next(response);
     },
-    onError: (DioError e, RequestInterceptorHandler handler) {
+    onError: (DioError e, ErrorInterceptorHandler handler) {
       // 如果你想完成请求并返回一些自定义数据，你可以使用 `handler.resolve(response)`。
       return handler.next(e);
     },

dio/README.md

@@ -423,17 +423,17 @@ dio.interceptors.add(
       // you can reject with a `DioError` using `handler.reject(dioError)`.
       return handler.next(options);
     },
-    onResponse: (Response response, RequestInterceptorHandler handler) {
+    onResponse: (Response response, ResponseInterceptorHandler handler) {
       // Do something with response data.
       // If you want to reject the request with a error message,
-      // you can reject a `DioError` object eg: `handler.reject(dioError)`.
+      // you can reject a `DioError` object using `handler.reject(dioError)`.
       return handler.next(response);
     },
-    onError: (DioError e, RequestInterceptorHandler handler) {
-      // Do something with response error
-      // If you want to resolve the request with some custom data
-      // you can resolve a `Response` object eg: `handler.resolve(response)`.
-      return handler.next(e);//continue
+    onError: (DioError e, ErrorInterceptorHandler handler) {
+      // Do something with response error.
+      // If you want to resolve the request with some custom data,
+      // you can resolve a `Response` object using `handler.resolve(response)`.
+      return handler.next(e);
     },
   ),
 );