Add extra note to "Using PyPI's trusted publishing" section.

Add extra note to "Using PyPI's trusted publishing" section to
solve issues publishing to PyPI when "Environment name" is set
on PyPI.

Based on: #1575 (comment)

guide/src/distribution.md

@@ -300,5 +300,6 @@ By default, the workflow provided by `generate-ci` will publish the release arti
 To enable it, modify the `release` action in the generated GitHub workflow file:
 - remove `MATURIN_PYPI_TOKEN` from the `env` section to make maturin use trusted publishing
 - add `id-token: write` to the action's `permissions` (see [Configuring OpenID Connect in PyPI](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-pypi) from GitHub's documentation).
+- if `Environment name: release` was set in PyPI, add `environment: release`
 
 Make sure to follow the steps listed in [PyPI's documentation](https://docs.pypi.org/trusted-publishers/adding-a-publisher/) to set up your GitHub repository as a trusted publisher in the PyPI project settings before attempting to run the workflow.