Fix link (react-navigation#552)

Author: brunolemos

website/blog/2019-10-17-react-navigation-native.md

@@ -37,4 +37,4 @@ We believe you will find it useful in your projects and strongly encourage you t
 
 Please, note that we don’t intend this component to be a drop-off replacement for the currently existing stack. There are many benefits of using JavaScript-based stack. Moreover, the range of customization of the native stack is very limited and probably won’t get broader due to the limitations of native API.
 
-Native Stack is available in the new 5.0 alpha API and with [Satyajit](undefined)’s help, I have managed to release the first version of the [library](https://www.npmjs.com/package/@react-navigation/native-stack) a few days ago. It’s in alpha so don’t expect everything to be perfect, but… don’t hesitate to submit a [PR](https://github.com/react-navigation/navigation-ex/pulls) and help us grow React Navigation!
+Native Stack is available in the new 5.0 alpha API and with [Satyajit](https://github.com/satya164)’s help, I have managed to release the first version of the [library](https://www.npmjs.com/package/@react-navigation/native-stack) a few days ago. It’s in alpha so don’t expect everything to be perfect, but… don’t hesitate to submit a [PR](https://github.com/react-navigation/navigation-ex/pulls) and help us grow React Navigation!