Add note for iOS9 url scheme changes

Summary: Closes https://github.com/facebook/react-native/pull/3354

Reviewed By: @​svcscm

Differential Revision: D2531433

Pulled By: @javache

fb-gh-sync-id: a7d280f6f8d3e6fa723c6518110ca344f9583ddd

Libraries/LinkingIOS/LinkingIOS.js

@@ -127,8 +127,11 @@ class LinkingIOS {
   }
 
   /**
-   * Determine wether or not an installed app can handle a given `url`
+   * Determine whether or not an installed app can handle a given `url`
    * The callback function will be called with `bool supported` as the only argument
+   *
+   * NOTE: As of iOS 9, your app needs to provide a `LSApplicationQueriesSchemes` key 
+   * inside `Info.plist`.
    */
   static canOpenURL(url: string, callback: Function) {
     invariant(