Fix link to docs (#1)

* Fix link to docs

Got a 404 with the old url

* Update README.md

Author: alkhatib

README.md

@@ -40,7 +40,7 @@ Here's an example code change you can make for this app:
 
 ## Learn More ##
 
-You can learn more about the App Platform and how to manage and update your application at https://www.digitalocean.com/docs/apps/.
+You can learn more about the App Platform and how to manage and update your application at https://www.digitalocean.com/docs/app-platform/.
 
 
 ## Deleting the App #