update errata workflow

create an fdf with a summary of the errata
this fdf is versioned and references the errata
the fdf is internal only and not published.

it is applied to the respective .final version of the specification.
the fdf after modifying the notes author to "CIP4" is applied to the pdf.
the combined pdfwith fdf notes merged is published on the specification page as spec-final.errata.notes.pdf

review of the pdf with fdf notes included is part of tsc verify

2.0 higher priority
1.6: simple sticky note that references the errata