fix: update iApp Generator documentation to clarify Docker requirements

- Changed the Docker requirement to specify the need for a Docker hub account, enhancing user understanding of prerequisites for using the iApp Generator.

Author: akugone

src/build-iapp/iapp-generator/getting-started.md

@@ -6,7 +6,7 @@ Before using the iApp Generator, make sure you have:
 
 \- [**Node.js**](https://nodejs.org/en/) version 20 or higher
 
-\- **Docker**
+\- **Docker / Docker hub account**
 
 \- **Docker Buildx** _(for macOS users, check AMD64 compatibility)_