Code samples don't match up what's with on Snack sample

The following code snippet here:

https://reactnavigation.org/docs/modal

under create modal stack - does not match with the code snippet on the linked snack example:

https://snack.expo.io/?platform=android&name=Navigation%20lifecycle%20%7C%20React%20Navigation&dependencies=%40react-native-community%2Fmasked-view%40%5E0.1.1%2C%40react-navigation%2Fnative%40%5E5.0.5%2C%40react-navigation%2Fbottom-tabs%40%5E5.0.5%2C%40react-navigation%2Fdrawer%40%5E5.0.5%2C%40react-navigation%2Fmaterial-bottom-tabs%40%5E5.0.5%2C%40react-navigation%2Fmaterial-top-tabs%40%5E5.0.5%2C%40react-navigation%2Fstack%40%5E5.0.5%2Creact-native-gesture-handler%401.5.2%2Creact-native-reanimated%401.4.0%2Creact-native-safe-area-context%400.6.0%2Creact-native-screens%402.0.0-alpha.12&sourceUrl=https%3A%2F%2Freactnavigation.org%2Fexamples%2F5.x%2Ffull-screen-modal.js

For example, the following line in the docs:

function RootStackScreen() {
  return (
    <RootStack.Navigator mode="modal">
      <RootStack.Screen
        name="Main"
        component={MainStackScreen}
        options={{ headerShown: false }}
      />
      <RootStack.Screen name="MyModal" component={ModalScreen} />
    </RootStack.Navigator>
  );
}

does not exist in the Snack example. It should probably reflect the same code so as not to be confusing to new users.

将 reactnavigation.org/docs/modal 中的 modal 页面与链接的 Snack 示例及其源 URL 进行比较。首先检查创建 modal stack 的代码片段与 Snack 代码是否一致；当文档和示例展示相同的实现，或清楚解释任何有意的差异时，即可视为完成。