Update README.md

Author: yuval-sentry

README.md

@@ -39,7 +39,7 @@ From our [documentation](https://docs.sentry.io/platforms/react-native/), the fo
 
 1. git clone [email protected]:sentry-demos/sentry_react_native.git
 2. Add your DSN and BACKEND_URL for back-end to src/config.ts
-3. `export SENTRY_AUTH_TOKEN=<token>`
+3. `export const SENTRY_AUTH_TOKEN=<token>`
 4. Setup a Android Virtual Device via AVD Manager.
 5. If you don't have cocopods or get an error about cocopods out of date, run `gem install cocopods`
 6. `cd ios && pod install`
@@ -156,4 +156,4 @@ You may run into issues if you haven't added sdk and sdk platform-tools to path:
 If tools don't load, then swipe-away (kill) the app, then relaunch from app menu in the emulator. If still fails, then go to AVD Manager and 'wipe' the device and run the emulator again.
 Could also be a problem with the backend container/app you're requesting the tools from (check that URL/Postman, check TDA job)
 
-When developing locally, must point React Native to http://127.0.0.1:8080/products backend instead of https://localhost:8080/products backend.
+When developing locally, must point React Native to http://127.0.0.1:8080/products backend instead of https://localhost:8080/products backend.