Update source/handbook/engineering/development/ci-cd/package/index.html.md.erb

Why is this change being made?

We are intending to document the root causes of missed deliverables to iterate our process and improve our "say do" ratio - what we commit to is important as are the causes of missing those commitments.

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what