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/surfl.m
+++ b/scripts/plot/surfl.m
@@ -22,20 +22,32 @@
 ## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z}, @var{L})
 ## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z}, @var{L}, @var{P})
 ## @deftypefnx {Function File} {} surfl (@dots{}, "light")
-## Plot a lighted surface given matrices @var{x}, and @var{y} from
-## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and
-## @var{y} coordinates of the mesh.  If @var{x} and @var{y} are vectors, then
-## a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)).  Thus, columns
-## of @var{z} correspond to different @var{x} values and rows of @var{z}
-## correspond to different @var{y} values.
+## @deftypefnx {Function File} {} surfl (@var{hax}, @dots{})
+## @deftypefnx {Function File} {@var{h} =} surfl (@dots{})
+##
+## Plot a 3-D surface using shading based on various lighting models.
 ##
-## The light direction can be specified using @var{L}.  It can be given as a
-## 2-element vector [azimuth, elevation] in degrees or as a 3-element vector
-## [lx, ly, lz].  The default value is rotated 45 degrees counterclockwise
-## from the current view.
+## The surface mesh is plotted using shaded rectangles.  The vertices of the
+## rectangles [@var{x}, @var{y}] are typically the output of @code{meshgrid}.
+## over a 2-D rectangular region in the x-y plane.  @var{z} determines the
+## height above the plane of each vertex.  If only a single @var{z} matrix is
+## given, then it is plotted over the meshgrid
+## @code{@var{x} = 1:columns (@var{z}), @var{y} = 1:rows (@var{z})}.
+## Thus, columns of @var{z} correspond to different @var{x} values and rows
+## of @var{z} correspond to different @var{y} values.  
 ##
-## The material properties of the surface can specified using a 4-element vector
-## @var{P} = [@var{AM} @var{D} @var{SP} @var{exp}] which defaults to
+## The default lighting mode "cdata", changes the cdata property of the
+## surface object to give the impression of a lighted surface.
+## @strong{Warning:} The alternative mode "light" mode which creates a light
+## object to illuminate the surface is not implemented (yet).
+##
+## The light source location can be specified using @var{L}.  It can be given
+## as a 2-element vector [azimuth, elevation] in degrees, or as a 3-element
+## vector [lx, ly, lz].  The default value is rotated 45 degrees
+## counterclockwise to the current view.
+##
+## The material properties of the surface can specified using a 4-element
+## vector @var{P} = [@var{AM} @var{D} @var{SP} @var{exp}] which defaults to
 ## @var{p} = [0.55 0.6 0.4 10].
 ##
 ## @table @asis
@@ -48,10 +60,11 @@
 ## @item "EXP" specular exponent
 ## @end table
 ##
-## The default lighting mode "cdata", changes the cdata property to give the
-## impression of a lighted surface.  Please note: the alternative "light"
-## mode, which creates a light object to illuminate the surface is not
-## implemented (yet).
+## 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 return value @var{h} is a graphics handle to the created
+## surface object.
 ##
 ## Example:
 ##
@@ -62,7 +75,7 @@
 ## shading interp;
 ## @end group
 ## @end example
-## @seealso{surf, diffuse, specular, surface}
+## @seealso{diffuse, specular, surf, shading, colormap, caxis}
 ## @end deftypefn
 
 ## Author: Kai Habel <kai.habel@gmx.de>