Add OAuth flow info from README

Author: jdnichollsc

README.md

@@ -127,7 +127,7 @@ Methods       | Action
 ------------- | ------
 `open`        | Opens the url with Safari in a modal on iOS using **SFSafariViewController**, and Chrome in a new custom tab on Android. On iOS, the modal Safari will not share cookies with the system Safari.
 `close`       | Dismisses the system's presented web browser
-`openAuth`    | Opens the url with Safari in a modal on iOS using **SFAuthenticationSession/ASWebAuthenticationSession**, and Chrome in a new custom tab on Android. On iOS, the user will be asked whether to allow the app to authenticate using the given url.
+`openAuth`    | Opens the url with Safari in a modal on iOS using **SFAuthenticationSession/ASWebAuthenticationSession**, and Chrome in a new custom tab on Android. On iOS, the user will be asked whether to allow the app to authenticate using the given url **(OAuth flow with deep linking redirection)**.
 `closeAuth`   | Dismisses the current authentication session
 `isAvailable` | Detect if the device supports this plugin