Relax error for 'function integrate_projected_dbc!(::HcurlConformity, Kᶠ, fᶠ, bc_fun, fv, shape_nrs, cell_coords, time)'

I was trying out the 3D Nedelec elements in the new ferrite version. The function `function integrate_projected_dbc!(::HcurlConformity, Kᶠ, fᶠ, bc_fun, fv, shape_nrs, cell_coords, time)` has ` throw(ArgumentError("ProjectedDirichlet is not implemented for 3D H(curl) conformity"))`. I tested commenting out the error, and I got correct results using zero-Dirichlet boundary conditions. Can this ArgumentError be removed, or be changed to warning instead?

I also think the ProjectedDirichlet docs should be updated, as it appears the required function signature is: `bc_fun(x, time, n)`, but the docs implied to me that a function `fun(x,time)` should be used. It seems that `bc_fun` could be implicitly created as `bc_fun(x, time, n) = cross(n, fun(x,time))` in the projected Dirichlet implementation.