doc: fix typo (#769)

Author: aluedeke

README.md

@@ -29,7 +29,7 @@ Appium community currently has two drivers for Flutter environment:
 
 As a baseline, we recommend using [official testing tools and strategy](https://docs.flutter.dev/testing/overview) to test Flutter apps as possible in Dart.
 
-If you'd like to test a release app, whcih can be released from app store as-is, Appium [UIAutomator2](https://github.com/appium/appium-uiautomator2-driver)/[XCUITest](https://github.com/appium/appium-xcuitest-driver) driver is a good choice. Since Flutter 3.19, Flutter apps can expose [`identifier` for `SemanticsProperties`](https://api.flutter.dev/flutter/semantics/SemanticsProperties/identifier.html) as `resource-id` in Android and `accessibilityIdentifier` in iOS. They should help to achieve automation against release apps with Appium [UIAutomator2](https://github.com/appium/appium-uiautomator2-driver)/[XCUITest](https://github.com/appium/appium-xcuitest-driver) as blackbox testing.
+If you'd like to test a release app, which can be released from app store as-is, Appium [UIAutomator2](https://github.com/appium/appium-uiautomator2-driver)/[XCUITest](https://github.com/appium/appium-xcuitest-driver) driver is a good choice. Since Flutter 3.19, Flutter apps can expose [`identifier` for `SemanticsProperties`](https://api.flutter.dev/flutter/semantics/SemanticsProperties/identifier.html) as `resource-id` in Android and `accessibilityIdentifier` in iOS. They should help to achieve automation against release apps with Appium [UIAutomator2](https://github.com/appium/appium-uiautomator2-driver)/[XCUITest](https://github.com/appium/appium-xcuitest-driver) as blackbox testing.
 
 - Appium Flutter driver has three contexts to manage the application under test and the device under test. To achieve the `FLUTTER` context, the test package requires testing tools to import. The application under test cannot release as-is.
     - `FLUTTER` context sends commands to the Dart VM directly over the observatory URL. This allows you to interact with Flutter elements directly.