Corrected README.md spelling (#1268)

Author: spencer-barrett

README.md

@@ -3,7 +3,7 @@
 The Flutter permission_handler plugin is build following the federated plugin architecture. A detailed explanation of the federated plugin concept can be found in the [Flutter documentation](https://flutter.dev/docs/development/packages-and-plugins/developing-packages#federated-plugins). This means the permission_handler plugin is separated into the following packages:
 
 1. [`permission_handler`][1]: the app facing package. This is the package users depend on to use the plugin in their project. For details on how to use the `permission_handler` plugin you can refer to its [README.md][2] file. At this moment the Android and iOS platform implementations are also part of this package. Additional platform support will be added in their own individual "platform package(s)".
-2. [`permission_handler_platform_interface`][3]: this packages declares the interface which all platform packages must implement to support the app-facing package. Instructions on how to implement a platform packages can be found int the [README.md][4] of the `permission_handler_platform_interface` package.
+2. [`permission_handler_platform_interface`][3]: this packages declares the interface which all platform packages must implement to support the app-facing package. Instructions on how to implement a platform packages can be found in the [README.md][4] of the `permission_handler_platform_interface` package.
 
 [1]: https://pub.dev/packages/permission_handler
 [2]: ./permission_handler/README.md