Add production build section to docs (facebook#5900)

Author: ianschmitz

docusaurus/docs/available-scripts.md

@@ -20,9 +20,9 @@ Launches the test runner in the interactive watch mode. See the section about [r
 
 Builds the app for production to the `build` folder. It correctly bundles React in production mode and optimizes the build for the best performance.
 
-The build is minified and the filenames include the hashes. Your app is ready to be deployed!
+The build is minified and the filenames include the hashes. See the [production build](production-build.md) section for more information.
 
-See the section about [deployment](deployment.md) for more information.
+Your app is ready to be deployed! See the section about [deployment](deployment.md) for more information about deploying your application to popular hosting providers.
 
 ## `npm run eject`
 

docusaurus/docs/code-splitting.md

@@ -45,7 +45,7 @@ class App extends Component {
 export default App;
 ```
 
-This will make `moduleA.js` and all its unique dependencies as a separate chunk that only loads after the user clicks the 'Load' button.
+This will make `moduleA.js` and all its unique dependencies as a separate chunk that only loads after the user clicks the 'Load' button. For more information on the chunks that are created, see the [production build](production-build.md) section.
 
 You can also use it with `async` / `await` syntax if you prefer it.