doc: Rewrite docstrings for most plot functions. Emphasize clarity, use common "voice", and increase density of seealso links. * doc/interpreter/plot.txi: Add @findex entries that were in xlim.m * scripts/miscellaneous/getappdata.m scripts/miscellaneous/setappdata.m, scripts/plot/allchild.m, scripts/plot/ancestor.m, scripts/plot/area.m, scripts/plot/axes.m, scripts/plot/axis.m, scripts/plot/bar.m, scripts/plot/barh.m, scripts/plot/box.m, scripts/plot/caxis.m, scripts/plot/cla.m, scripts/plot/clabel.m, scripts/plot/clf.m, scripts/plot/close.m, scripts/plot/closereq.m, scripts/plot/colorbar.m, scripts/plot/comet.m, scripts/plot/comet3.m, scripts/plot/compass.m, scripts/plot/contour.m, scripts/plot/contour3.m, scripts/plot/contourc.m, scripts/plot/contourf.m, scripts/plot/copyobj.m, scripts/plot/cylinder.m, scripts/plot/daspect.m, scripts/plot/diffuse.m, scripts/plot/ellipsoid.m, scripts/plot/errorbar.m, scripts/plot/ezcontour.m, scripts/plot/ezcontourf.m, scripts/plot/ezmesh.m, scripts/plot/ezmeshc.m, scripts/plot/ezplot.m, scripts/plot/ezplot3.m, scripts/plot/ezpolar.m, scripts/plot/ezsurf.m, scripts/plot/ezsurfc.m, scripts/plot/feather.m, scripts/plot/figure.m, scripts/plot/fill.m, scripts/plot/findall.m, scripts/plot/findobj.m, scripts/plot/fplot.m, scripts/plot/gca.m, scripts/plot/gcbf.m, scripts/plot/gcbo.m, scripts/plot/gcf.m, scripts/plot/gco.m, scripts/plot/ginput.m, scripts/plot/graphics_toolkit.m, scripts/plot/grid.m, scripts/plot/gtext.m, scripts/plot/guidata.m, scripts/plot/guihandles.m, scripts/plot/hdl2struct.m, scripts/plot/hggroup.m, scripts/plot/hidden.m, scripts/plot/hist.m, scripts/plot/hold.m, scripts/plot/ishghandle.m, scripts/plot/ishold.m, scripts/plot/isocolors.m, scripts/plot/isprop.m, scripts/plot/legend.m, scripts/plot/line.m, scripts/plot/linkprop.m, scripts/plot/loglog.m, scripts/plot/loglogerr.m, scripts/plot/mesh.m, scripts/plot/meshc.m, scripts/plot/meshgrid.m, scripts/plot/meshz.m, scripts/plot/newplot.m, scripts/plot/orient.m, scripts/plot/pareto.m, scripts/plot/patch.m, scripts/plot/pcolor.m, scripts/plot/peaks.m, scripts/plot/pie.m, scripts/plot/pie3.m, scripts/plot/plot.m, scripts/plot/plot3.m, scripts/plot/plotmatrix.m, scripts/plot/plotyy.m, scripts/plot/polar.m, scripts/plot/print.m, scripts/plot/quiver.m, scripts/plot/quiver3.m, scripts/plot/rectangle.m, scripts/plot/refresh.m, scripts/plot/refreshdata.m, scripts/plot/ribbon.m, scripts/plot/rose.m, scripts/plot/saveas.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/shading.m, scripts/plot/shg.m, scripts/plot/shrinkfaces.m, scripts/plot/slice.m, scripts/plot/specular.m, scripts/plot/sphere.m, scripts/plot/stairs.m, scripts/plot/stem.m, scripts/plot/stem3.m, scripts/plot/struct2hdl.m, scripts/plot/subplot.m, scripts/plot/surf.m, scripts/plot/surface.m, scripts/plot/surfc.m, scripts/plot/surfl.m, scripts/plot/tetramesh.m, scripts/plot/text.m, scripts/plot/title.m, scripts/plot/trimesh.m, scripts/plot/triplot.m, scripts/plot/trisurf.m, scripts/plot/view.m, scripts/plot/waitbar.m, scripts/plot/waitforbuttonpress.m, scripts/plot/waterfall.m, scripts/plot/whitebg.m, scripts/plot/xlabel.m, scripts/plot/xlim.m, scripts/plot/ylabel.m, scripts/plot/ylim.m, scripts/plot/zlabel.m, scripts/plot/zlim.m: Rewrite docstrings for most plot functions. Emphasize clarity, use common "voice", and increase density of seealso links.

--- a/scripts/plot/barh.m	Wed Jul 31 13:49:06 2013 -0700
+++ b/scripts/plot/barh.m	Wed Jul 31 13:53:30 2013 -0700
@@ -17,19 +17,21 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn  {Function File} {} barh (@var{x}, @var{y})
-## @deftypefnx {Function File} {} barh (@var{y})
-## @deftypefnx {Function File} {} barh (@var{x}, @var{y}, @var{w})
-## @deftypefnx {Function File} {} barh (@var{x}, @var{y}, @var{w}, @var{style})
-## @deftypefnx {Function File} {} barh (@dots{}, @var{prop}, @var{val})
-## @deftypefnx {Function File} {} barh (@var{h}, @dots{})
-## @deftypefnx {Function File} {@var{h} =} barh (@dots{})
-## Produce a horizontal bar graph from two vectors of x-y data.
+## @deftypefn  {Function File} {} barh (@var{y})
+## @deftypefnx {Function File} {} barh (@var{x}, @var{y})
+## @deftypefnx {Function File} {} barh (@dots{}, @var{w})
+## @deftypefnx {Function File} {} barh (@dots{}, @var{style})
+## @deftypefnx {Function File} {} barh (@dots{}, @var{prop}, @var{val}, @dots{})
+## @deftypefnx {Function File} {} barh (@var{hax}, @dots{})
+## @deftypefnx {Function File} {@var{h} =} barh (@dots{}, @var{prop}, @var{val}, @dots{})
+## Produce a horizontal bar graph from two vectors of X-Y data.
 ##
-## If only one argument is given, it is taken as a vector of y-values
-## and the x coordinates are taken to be the indices of the elements.
+## If only one argument is given, it is taken as a vector of Y values
+## and the X coordinates are the range @code{1:numel (@var{y})}.
 ##
-## The default width of 0.8 for the bars can be changed using @var{w}.
+## The optional input @var{w} controls the width of the bars.  A value of
+## 1.0 will cause each bar to exactly touch any adjacent bars.
+## The default width is 0.8.
 ##
 ## If @var{y} is a matrix, then each column of @var{y} is taken to be a
 ## separate bar graph plotted on the same graph.  By default the columns
@@ -37,16 +39,16 @@
 ## argument, which can take the values @code{"grouped"} (the default),
 ## or @code{"stacked"}.
 ##
-## Passing the optional input handle @var{h} will draw the resulting plot
-## in the specified handle.
+## Optional property/value pairs are passed directly to the underlying patch
+## objects.
+##
+## If the first argument @var{hax} is an axes handle, then plot into this axis,
+## rather than the current axes returned by @code{gca}.
 ## 
-## Properties of the patch graphics object can be changed using
-## @var{prop}, @var{val} pairs.
-##
 ## The optional return value @var{h} is a graphics handle to the created
-## bar series object.  See @code{bar} for a description of the use of the
-## bar series.
-## @seealso{bar, plot}
+## bar series hggroup.  For a description of the use of the
+## bar series, @pxref{XREFbar,,bar}.
+## @seealso{bar, hist, pie, plot, patch}
 ## @end deftypefn
 
 ## Author: jwe