docs(releasing): update the minor release checklist for automatic helm-charts releases

[thomasqueirozb]

Summary

Keep release instructions accurate.

References

• Related: feat(releasing): Release without pull requests during a release freeze helm-charts#601

• Related: fix(ci): start the Helm release after post-release housekeeping #26542

Vector configuration

NA

How did you test this PR?

make check-markdown passed.

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

[chatgpt-codex-connector]

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[datadoghq-integration]

The minor-release checklist misrepresents the Helm job dependency: prepare-helm-release and housekeeping run independently after Release, so retrying a failed housekeeping job will not re-trigger Helm, potentially leaving the release freeze open.

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