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/plot.m
+++ b/scripts/plot/plot.m
@@ -209,17 +209,18 @@
 %!demo
 %! x = 1:5;  y = 1:5;
 %! plot (x,y,'g');
-%! title ('plot of green line at 45 degrees');
+%! title ('plot() of green line at 45 degrees');
 
 %!demo
 %! x = 1:5;  y = 1:5;
 %! plot (x,y,'g*');
-%! title ('plot of green stars along a line at 45 degrees');
+%! title ('plot() of green stars along a line at 45 degrees');
 
 %!demo
 %! x1 = 1:5;  y1 = 1:5;
 %! x2 = 5:9; y2 = 5:-1:1;
 %! plot (x1,y1,'bo-', x2,y2,'rs-');
 %! axis ('tight');
-%! title ('plot of blue circles ascending and red squares descending with connecting lines drawn'); 
+%! title ({'plot() of blue circles ascending and red squares descending';
+%!         'connecting lines drawn'});