docs: Update README

README-ZH.md

@@ -213,8 +213,8 @@ Android 10 引入了 **Scoped Storage**，导致原始资源文件不能通过
 
 ```dart
 final PermissionState ps = await PhotoManager.requestPermissionExtend();
-if (ps.isAuth) {
-  // 已获取到权限。
+if (ps.hasAccess) {
+  // 已获取到权限（哪怕只是有限的访问权限）。
 } else {
   // 权限受限制（iOS）或者被拒绝，使用 `==` 能够更准确的判断是受限还是拒绝。
   // 你可以使用 `PhotoManager.openSetting()` 打开系统设置页面进行进一步的逻辑定制。

README.md

@@ -222,9 +222,9 @@ It's pretty much the same as the `NSPhotoLibraryUsageDescription`.
 Most of the APIs can only use with granted permission.
 
 ```dart
-final PermissionState ps = await PhotoManager.requestPermissionExtend();
-if (ps.isAuth) {
-  // Granted.
+final PermissionState ps = await PhotoManager.requestPermissionExtend(); // the method can use optional param `permission`.
+if (ps.hasAccess) {
+  // Granted or limited.
 } else {
   // Limited(iOS) or Rejected, use `==` for more precise judgements.
   // You can call `PhotoManager.openSetting()` to open settings for further steps.

lib/src/types/types.dart

@@ -87,6 +87,7 @@ class PermissionRequestOption with IMapMixin {
     ),
   });
 
+  /// See [IosAccessLevel].
   final IosAccessLevel iosAccessLevel;
 
   /// See [AndroidPermission].