We were filtering this document from the docs list but
not removing it from the module export lists.
We can actually filter it out much easier at the TypeScript
parsing point, which means we do not need the
`filterIgnoredDocs` processor any more.
Closes#16287
This is to tidy up the `author-packagse`, which currently duplicates a
lot of the configuration in the main packages. We need to
DRY this up so that we don't fall foul of a change in one being missed in
the other.
Peter Bacon Darwin