fix typo

Author: sloriot

Generator/doc/Generator/PackageDescription.txt

@@ -67,7 +67,7 @@ achieve random permutations for otherwise regular generators (
 - `CGAL::Random_points_in_tetrahedral_mesh_3<C3t3>`
 - `CGAL::Random_points_in_square_2<Point_2, Creator>` 
 - `CGAL::Random_points_on_circle_2<Point_2, Creator>` 
-- `CGAL::Random_points_on_triangle_mesh_2<Point_2, Triangulation>`
+- `CGAL::Random_points_in_triangle_mesh_2<Point_2, Triangulation>`
 - `CGAL::Random_points_in_triangle_mesh_3<Point_3, Mesh>`
 - `CGAL::Random_points_in_tetrahedral_mesh_boundary_3<C3t3>`
 - `CGAL::Random_points_on_segment_2<Point_2, Creator>`