Document Linking

Summary:
Both LinkingIOS and IntentAndroid are deprecated in favor of Linking but it was not in the website documentation.
Closes https://github.com/facebook/react-native/pull/5642

Reviewed By: svcscm

Differential Revision: D2883999

Pulled By: androidtrunkagent

fb-gh-sync-id: cd2ce6192f84fffef7ab7d4e56f87eb55fb30901

website/server/extractDocs.js

@@ -238,6 +238,7 @@ var apis = [
   '../Libraries/Components/Intent/IntentAndroid.android.js',
   '../Libraries/Interaction/InteractionManager.js',
   '../Libraries/LayoutAnimation/LayoutAnimation.js',
+  '../Libraries/Linking/Linking.js',
   '../Libraries/LinkingIOS/LinkingIOS.js',
   '../Libraries/ReactIOS/NativeMethodsMixin.js',
   '../Libraries/Network/NetInfo.js',