fix typos

permission_handler/README.md

@@ -173,9 +173,9 @@ You can also open the app settings:
 
 ```dart
 if (await Permission.speech.isPermanentlyDenied) {
-  // The user opted to never again seeing the permission request dialog from
-  // this app. The only way to change the permission's status now is to let the
-  // user manually enable permissions in the system settings.
+  // The user opted to never again see the permission request dialog for this
+  // app. The only way to change the permission's status now is to let the
+  // user manually enable it in the system settings.
   openAppSettings();
 }
 ```