Merge pull request #4262 from rreusser/note-on-geolocation-docs

[Docs] Note that Android geolocation not yet open sourced

Libraries/Geolocation/Geolocation.js

@@ -42,6 +42,10 @@ type GeoOptions = {
  * app's `AndroidManifest.xml`:
  *
  * `<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />`
+ *
+ * Geolocation support for Android is planned but not yet open sourced. See
+ * [Known Issues](http://facebook.github.io/react-native/docs/known-issues.html#missing-modules-and-native-views).
+ *
  */
 var Geolocation = {