Deep linking instruction may need an update

I'm trying to implement deep linking in my app but there are some inconsistencies between React Navigation's doc, React Native's and Android's which makes me feel confusing. For example, in https://reactnavigation.org/docs/en/deep-linking.html#android-1 it's talking about "Set launchMode of MainActivity to singleTask" with a link to the respective Android doc page, however there's no mentioning about this over there and the XML code snippet looks quite different; same is also true for the iOS section, the snippet given in https://reactnavigation.org/docs/en/deep-linking.html#ios-1 was outdated according to https://facebook.github.io/react-native/docs/linking

Someone in the know may wanna look into this and update the docs.

Compare the React Navigation deep-linking page with the linked React Native, Android, and iOS documentation, focusing on the launchMode and platform code snippets mentioned in the issue. Update the instructions so they match the current platform guidance, then verify that the deep-linking documentation is consistent across sections.