Two components of the boundary of \(\text \textbf{I}_3\). (Deux composantes du bord de \(\text \textbf{I}_3\)) Bonnes petites composantes des schémas de Hilbert de courbes lisses de \({\mathbb{P}}^ n\). (Good small components of Hilbert schemes of smooth curves in \({\mathbb{P}}^ n)\) 