Updated property references for text and graphics functions (bug #50247) * /scripts/gui/dialog.m, waitbar.m: added Figure Properties reference * /scripts/gui/setappdata.m: added getappdata propery reference * /scripts/image/imagesc.m: added Image Properties reference * /scripts/image/imread.m: added Representing Images reference * /scripts/plot/appearance/clabel.m, gtext.m, xlabel.m, ylabel.m, zlabel.m: added Text Properties reference * /scripts/plot/appearance/legend.m: added Graphics Object Properties reference * /scripts/plot/appearance/private/__gnuplot_legend__.m: added Graphics Object Properties reference * /scripts/plot/draw/area.m, bar.m, barh.m, fill.m, hist.m, rectangle.m, scatter.m, scatter3.m, tetramesh.m, trimesh.m, trisurf.m: added Patch Properties reference * /scripts/plot/draw/colorbar.m: add Axes Properties reference * /scripts/plot/util/hggroup.m, subplot.m: added Axes Properties reference * /scripts/plot/draw/fplot.m, plot.m, plot3.m, stairs.m, stem.m, stem3.m: add/update Line Properties reference * /scripts/plot/draw/mesh.m, meshc.m, meshz.m, surf.m, surfc.m, surfnorm.m, waterfall.m: add/update Surface Properties reference * /doc/interpreter/plot.txi: removed redundant text properties link

--- a/scripts/gui/waitbar.m	Sat Sep 12 13:49:50 2020 -0700
+++ b/scripts/gui/waitbar.m	Tue Feb 18 21:35:39 2020 -0500
@@ -44,7 +44,8 @@
 ## function handle @var{fcn}.
 ##
 ## The appearance of the waitbar figure window can be configured by passing
-## @var{prop}/@var{val} pairs to the function.
+## @var{prop}/@var{val} pairs to the function.  The full list of properties is
+## documented at @ref{Figure Properties}.
 ##
 ## When called with a single input the current waitbar, if it exists, is
 ## updated to the new value @var{frac}.  If there are multiple outstanding