Refine setup instructions for Expensify employees in README and contributing guides

Updated the README and Android/iOS setup guides to clarify steps for configuring the local development email account and pointing the emulator/simulator to the local VM.

Author: NicolasBonet

README.md

@@ -55,7 +55,6 @@ For detailed setup instructions for each platform, see the following guides:
    Access to fetch at 'https://www.expensify.com/api/BeginSignIn' from origin 'http://localhost:8080' has been blocked by CORS policy
    ```
    You probably have a misconfigured `.env` file - remove it (`rm .env`) and try again.
-3. Expensify engineers having an error `The given email is not valid` must [follow this instructions](https://stackoverflowteams.com/c/expensify/questions/23537/23538#23538) to configure the local dev email account.
 
 **Note:** Expensify engineers that will be testing with the API in your local dev environment please refer to [these additional instructions](https://stackoverflow.com/c/expensify/questions/7699/7700).
 

contributingGuides/SETUP_ANDROID.md

@@ -73,7 +73,8 @@ If you haven't done any intentional edits outside of `src/` (like adding new dep
 - Changes applied to Javascript will be applied automatically, any changes to native code will require a recompile
 
 ### Expensify Employees
-If you are an Expensify employee and want to point the emulator to your local VM, follow [this](https://stackoverflow.com/c/expensify/questions/7699)
+- To point the **Development Emulator** at your local VM, follow [these steps](https://stackoverflow.com/c/expensify/questions/7699).
+- You must configure the local dev email account; follow [these instructions](https://stackoverflowteams.com/c/expensify/questions/23537/23538#23538).
 
 ## Enabling Prebuilt React Native Artifacts
 

contributingGuides/SETUP_IOS.md

@@ -80,7 +80,8 @@ For an M1 Mac, read this [Stack Overflow post](https://stackoverflow.com/questio
 If you want to run the app on an actual physical iOS device, please follow the instructions [here](https://github.com/Expensify/App/blob/main/contributingGuides/HOW_TO_BUILD_APP_ON_PHYSICAL_IOS_DEVICE.md).
 
 ### Expensify Employees
-If you are an Expensify employee and want to point the emulator to your local VM, follow [this](https://stackoverflow.com/c/expensify/questions/7699)
+- To point the **Development Simulator** at your local VM, follow [these steps](https://stackoverflow.com/c/expensify/questions/7699).
+- You must configure the local dev email account; follow [these instructions](https://stackoverflowteams.com/c/expensify/questions/23537/23538#23538).
 
 ## Push Notifications Setup