Remove backwards compatibility grammar (#39845)
Remove backwards compatibility grammar (#39845)

This was not done in the previous merge commit, so that it could be
merged cleanly into release branches.

each/bind9-collab,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab