Add titles and clean-up plotting %!demos. * scripts/plot/area.m, scripts/plot/axis.m, scripts/plot/bar.m, scripts/plot/barh.m, scripts/plot/clabel.m, scripts/plot/colorbar.m, scripts/plot/comet.m, scripts/plot/comet3.m, scripts/plot/contour.m, scripts/plot/contour3.m, scripts/plot/contourf.m, scripts/plot/cylinder.m, scripts/plot/ellipsoid.m, scripts/plot/errorbar.m, scripts/plot/ezplot.m, scripts/plot/ezplot3.m, scripts/plot/ezpolar.m, scripts/plot/feather.m, scripts/plot/fplot.m, scripts/plot/hold.m, scripts/plot/isosurface.m, scripts/plot/legend.m, scripts/plot/loglog.m, scripts/plot/loglogerr.m, scripts/plot/mesh.m, scripts/plot/meshc.m, scripts/plot/meshz.m, scripts/plot/patch.m, scripts/plot/pcolor.m, scripts/plot/pie.m, scripts/plot/pie3.m, scripts/plot/plot.m, scripts/plot/plot3.m, scripts/plot/polar.m, scripts/plot/rectangle.m, scripts/plot/ribbon.m, scripts/plot/rose.m, scripts/plot/scatter.m, scripts/plot/scatter3.m, scripts/plot/semilogx.m, scripts/plot/semilogxerr.m, scripts/plot/semilogy.m, scripts/plot/semilogyerr.m, scripts/plot/sombrero.m, scripts/plot/stem3.m, scripts/plot/surf.m, scripts/plot/surfc.m, scripts/plot/surfl.m, scripts/plot/title.m, scripts/plot/waterfall.m: Add titles and clean-up plotting %!demos.

--- a/scripts/plot/legend.m
+++ b/scripts/plot/legend.m
@@ -1337,7 +1337,7 @@
 %! rand_2x3_data1 = [0.341447, 0.171220, 0.284370; 0.039773, 0.731725, 0.779382];
 %! bar (rand_2x3_data1);
 %! ylim ([0 1.0]);
-%! title ('legend() works for bar graphs (hgobjects)');
+%! title ('legend() works for bar graphs (hggroups)');
 %! legend ({'1st Bar', '2nd Bar', '3rd Bar'});
 
 %!demo
@@ -1345,7 +1345,7 @@
 %! rand_2x3_data2 = [0.44804, 0.84368, 0.23012; 0.72311, 0.58335, 0.90531];
 %! bar (rand_2x3_data2);
 %! ylim ([0 1.2]);
-%! title ('legend() works for bar graphs (hgobjects)');
+%! title ('legend() works for bar graphs (hggroups)');
 %! legend ('1st Bar', '2nd Bar', '3rd Bar');
 %! legend right;
 
@@ -1554,6 +1554,7 @@
 %!  legend (option);
 
 %!demo % bug 39697
+%! clf;
 %! plot (1:10);
 %! legend ("Legend Text");
 %! title ({"Multi-line", "titles", "are a", "problem"});