Update param-spec.txt, document padding params from params-spec.txt
This is @sready's MR from !90 (merged), but applied to the markdown.
I reviewed this; looks good; was just a copy of the same params from padding-spec.
This is @sready's MR from !90 (merged), but applied to the markdown.
I reviewed this; looks good; was just a copy of the same params from padding-spec.