Code review comment for ~paelzer/ubuntu/+source/ipxe:merge-ipxe-groovy-36a4c85-5

The non mentioning of d/control in f52d57afafbd9d2de5905263d701f87b374194dc is a good catch.
In fact the CL is right about what "should happen". This is a delta that can be dropped after Focal.
I've modified the commit and adapted the changelog.