On the page admin/marc_subfields_structure we now tell that Koha link
has been disabled and refer to the help for koha2marclinks.
On the page admin/koha2marclinks we mention that the Default mapping is
considered authoritative now.
Test plan:
Read these online help pages and verify that the changes make sense.
Signed-off-by: Josef Moravec <josef.moravec@gmail.com> Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>