Showing dependency-groups in README

[jaredahern]

Issue Kind

Improving documentation

Existing Link

https://github.com/python-poetry/poetry/blob/main/README.md

Description

Thank you very much for releasing Poetry 2.2.0 with PEP 735 support: I've been looking forward to this for a while. I see that the main README.md file shows [tool.poetry.group.*.dependencies]. I suggest that [dependency-groups] instead be shown here wherever possible, similar to how [project] is shown. Happy to contribute a PR if desired!

[radoering]

Agreed. We often only remember to update the docs but forget the readme.