The external link to `AbstractController` class was broken, both because
the placeholder substitution mechanism doesn't work in included RST
excerpts and because the class has long been removed.
Since it makes little sense to replace the link with another link to
the `useActionLinks` hook in the context of this reference doc, this
commit removes the link altogether, as well as the erroneous mention
of class limitations.
closesodoo/documentation#10731
X-original-commit: e7d2be6366
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>
3b8aca0892