message: fix: Vec3 -> Vector in mfem_coef example
diff: @@ -25,9 +25,9 @@ bcs = {
  first = -s * x * x
  last = s * x * x * (8.0 - x)
  if v.dim == 2 then
  - return Vec3.new(first, last)
  + return Vector.new(first, last)
  else
  - return Vec3.new(first, 0, last)
  + return Vector.new(first, 0, last)
  end
  end
  },
  