Update upgrading.mdx

amplify push does not generate amplifyconfiguration.json in some cases.

Author: joewired

src/fragments/lib/troubleshooting/common/upgrading.mdx

@@ -151,7 +151,7 @@ amplify upgrade
 amplify push
 ```
 
-This will generate a new configuration file called `amplifyconfiguration.json`
+This will generate a new configuration file called `amplifyconfiguration.json` (You may need to use amplify pull if there are no changes in your environment).
 
 Wherever you called `Amplify.configure({ aws-exports });` previously (usually in the root of your project) update your code as shown below