Modify Hello World in Grain

[rzuckerm]

To request a new code snippet, please fill out the following:

Project name: Hello World
Project link: https://sampleprograms.io/projects/hello-world
Language: Grain

If this code snippet will also be the first in a new language, please fill out the following:

Official Language Style Guide: none
Official Language Website: https://grain-lang.org/
Official Language Docker Image: https://ghcr.io/grain-lang/grain

The project link must be a link to a project on the Sample Programs Website project list.
If you would like to add a new project to the Sample Programs Website,
please first make a pull request to the Sample Programs Website.