Missing function tags

Summary:
It seems like it's not written in es6, hence no arrow functions, therefor we must have the function tag for it to work?
Closes #9463

Differential Revision: D3736797

fbshipit-source-id: c41bbd5f6867aa0f7668f8562e69dc2812eba80a

docs/Networking.md

@@ -47,7 +47,7 @@ The above examples show how you can make a request. In many cases, you will want
 Networking is an inherently asynchronous operation. Fetch methods will return a  [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) that make it straightforward to write code that works in an asynchronous manner:
 
   ```js
-  getMoviesFromApiAsync() {
+  function getMoviesFromApiAsync() {
     return fetch('https://facebook.github.io/react-native/movies.json')
       .then((response) => response.json())
       .then((responseJson) => {
@@ -62,7 +62,7 @@ Networking is an inherently asynchronous operation. Fetch methods will return a
 You can also use the proposed ES2017 `async`/`await` syntax in a React Native app:
 
   ```js
-  async getMoviesFromApi() {
+  async function getMoviesFromApi() {
     try {
       let response = await fetch('https://facebook.github.io/react-native/movies.json');
       let responseJson = await response.json();