message: fix stack references in README
diff: @@ -131,14 +131,14 @@ between the system:
  that was created in the networking stack. The stack needs to be in the form `<organization_or_user>/<projectName>/<stackName>`:
  ```bash
  - pulumi config set networkingStack stack72/networking-stack/dev
  + pulumi config set networkingStack stack72/networking-layer/dev
  ```
  You need to set a stack reference to the database stack so that the Application Instance can get the correct credentials
  and database information for application startup. The stack needs to be in the form `<organization_or_user>/<projectName>/<stackName>`:
  ```bash
  - pulumi config set networkingStack stack72/database-stack/dev
  + pulumi config set networkingStack stack72/database-layer/dev
  ```
  1. Deploy the application stack
  