message: doc review: rephrase non contiguous vertices
diff: @@ -171,7 +171,8 @@ class Alpha_complex {
  /** \brief Alpha_complex constructor from a list of points.
  *
  - * Duplicate points are inserted once in the Alpha_complex. This is the reason why the vertices may be not contiguous.
  + * The vertices may be not contiguous as some points may be discarded in the triangulation (duplicate points,
  + * weighted hidden point, ...).
  *
  * @param[in] points Range of points to triangulate. Points must be in Kernel::Point_d or Kernel::Weighted_point_d.
  *
  @@ -186,7 +187,8 @@ class Alpha_complex {
  /** \brief Alpha_complex constructor from a list of points and weights.
  *
  - * Duplicate points are inserted once in the Alpha_complex. This is the reason why the vertices may be not contiguous.
  + * The vertices may be not contiguous as some points may be discarded in the triangulation (duplicate points,
  + * weighted hidden point, ...).
  *
  * @param[in] points Range of points to triangulate. Points must be in Kernel::Point_d or Kernel::Weighted_point_d.
  *
  