Clarify step of the release process

[robertbrignull]

Clarifies a step of the release process so it's less likely someone will approve a potentially dangerous step of the workflow before running the rest of the release process checks.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.