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/contour3.m
+++ b/scripts/plot/contour3.m
@@ -22,13 +22,32 @@
 ## @deftypefnx {Function File} {} contour3 (@var{x}, @var{y}, @var{z})
 ## @deftypefnx {Function File} {} contour3 (@var{x}, @var{y}, @var{z}, @var{vn})
 ## @deftypefnx {Function File} {} contour3 (@dots{}, @var{style})
-## @deftypefnx {Function File} {} contour3 (@var{h}, @dots{})
+## @deftypefnx {Function File} {} contour3 (@var{hax}, @dots{})
 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contour3 (@dots{})
-## Plot level curves (contour lines) of the matrix @var{z}, using the
-## contour matrix @var{c} computed by @code{contourc} from the same
-## arguments; see the latter for their interpretation.  The contours are
-## plotted at the Z level corresponding to their contour.  The set of
-## contour levels, @var{c}, is only returned if requested.  For example:
+## Create a 3-D contour plot.
+##
+## @code{contour3} plots level curves (contour lines) of the matrix @var{z}
+## at a Z level corresponding to each contour.  This is in contrast to
+## @code{contour} which plots all of the contour lines at the same Z level
+## and produces a 2-D plot.
+##
+## The level curves are taken from the contour matrix @var{c} computed by
+## @code{contourc} for the same arguments; see the latter for their
+## interpretation.
+##
+## The appearance of contour lines can be defined with a line style @var{style}
+## in the same manner as @code{plot}.  Only line style and color are used;
+## Any markers defined by @var{style} are ignored.
+##
+## If the first argument @var{hax} is an axes handle, then plot into this axis,
+## rather than the current axes returned by @code{gca}.
+##
+## The optional output @var{c} are the contour levels in @code{contourc} format.
+##
+## The optional return value @var{h} is a graphics handle to the hggroup
+## comprising the contour lines.
+##
+## Example:
 ##
 ## @example
 ## @group
@@ -39,14 +58,7 @@
 ## @end group
 ## @end example
 ##
-## The style to use for the plot can be defined with a line style @var{style}
-## in a similar manner to the line styles used with the @code{plot} command.
-## Any markers defined by @var{style} are ignored.
-##
-## The optional input and output argument @var{h} allows an axis handle to
-## be passed to @code{contour} and the handles to the contour objects to be
-## returned.
-## @seealso{contourc, contour, contourf, patch, plot}
+## @seealso{contour, contourc, contourf, clabel, meshc, surfc, caxis, colormap, plot}
 ## @end deftypefn
 
 function [c, h] = contour3 (varargin)
@@ -66,7 +78,7 @@
 
   if (! ishold ())
     set (hax, "view", [-37.5, 30],
-         "xgrid", "on", "ygrid", "on", "zgrid", "on");
+              "xgrid", "on", "ygrid", "on", "zgrid", "on");
   endif
 
   if (nargout > 0)