Add doc for draw function, for point set 3 and polygon 2.

Point_set_3/doc/Point_set_3/CGAL/draw_point_set_3.h

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+namespace CGAL {
+  
+/*!
+\ingroup PkgDrawPointSet3D
+
+Open a new window and draw `aps`, an instance of the `CGAL::Point_set_3` class. The function is blocking, that is the program continues as soon as the user closes the window. This function requires CGAL_Qt5, and is only available if the flag CGAL_USE_BASIC_VIEWER is defined at compile time.
+\tparam PS an instance of the `CGAL::Point_set_3` class.
+\param aps the point set to draw.
+
+*/
+template<class PS>
+void draw(const PS& aps);
+
+} /* namespace CGAL */

Polygon/doc/Polygon/CGAL/draw_polygon_2.h

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+namespace CGAL {
+  
+/*!
+\ingroup PkgDrawPolygon2
+
+Open a new window and draw `ap`, an instance of the `CGAL::Polygon_2` class. The function is blocking, that is the program continues as soon as the user closes the window. This function requires CGAL_Qt5, and is only available if the flag CGAL_USE_BASIC_VIEWER is defined at compile time.
+\tparam P an instance of the `CGAL::Polygon_2` class.
+\param ap the polygon to draw.
+
+*/
+template<class P>
+void draw(const P& ap);
+
+} /* namespace CGAL */

Polygon/doc/Polygon/CGAL/draw_polygon_with_holes_2.h

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+namespace CGAL {
+  
+/*!
+\ingroup PkgDrawPolygonWithHoles2
+
+Open a new window and draw `aph`, an instance of the `CGAL::Polygon_with_holes_2` class. The function is blocking, that is the program continues as soon as the user closes the window. This function requires CGAL_Qt5, and is only available if the flag CGAL_USE_BASIC_VIEWER is defined at compile time.
+\tparam PH an instance of the `CGAL::Polygon_with_holes_2` class.
+\param aph the polygon with holes to draw.
+
+*/
+template<class PH>
+void draw(const PH& aph);
+
+} /* namespace CGAL */