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/clabel.m
+++ b/scripts/plot/clabel.m
@@ -21,23 +21,28 @@
 ## @deftypefnx {Function File} {} clabel (@var{c}, @var{h}, @var{v})
 ## @deftypefnx {Function File} {} clabel (@var{c}, @var{h}, "manual")
 ## @deftypefnx {Function File} {} clabel (@var{c})
-## @deftypefnx {Function File} {} clabel (@var{c}, @var{h})
 ## @deftypefnx {Function File} {} clabel (@dots{}, @var{prop}, @var{val}, @dots{})
 ## @deftypefnx {Function File} {@var{h} =} clabel (@dots{})
-## Add labels to the contours of a contour plot.  The contour plot is specified
-## by the contour matrix @var{c} and optionally the contourgroup object @var{h}
-## that are returned by @code{contour}, @code{contourf} and @code{contour3}.
-## The contour labels are rotated and placed in the contour itself.
+## Add labels to the contours of a contour plot.
+##
+## The contour levels are specified by the contour matrix @var{c} which is
+## returned by @code{contour}, @code{contourc}, @code{contourf}, and
+## @code{contour3}.  Contour labels are rotated to match the local line 
+## orientation and centered on the line.  The position of labels along the
+## contour line is chosen randomly.
+##
+## If the argument @var{h} is a handle to a contour group object, then label
+## this plot rather than the one in the current axes returned by @code{gca}.
 ##
 ## By default, all contours are labeled.  However, the contours to label can be
 ## specified by the vector @var{v}.  If the "manual" argument is given then
 ## the contours to label can be selected with the mouse.
 ##
 ## Additional property/value pairs that are valid properties of text objects
-## can be given and are passed to the underlying text objects.  Additionally,
-## the property "LabelSpacing" is available allowing the spacing between labels
-## on a contour (in points) to be specified.  The default is 144 points, or 2
-## inches.
+## can be given and are passed to the underlying text objects.  Moreover,
+## the contour group property "LabelSpacing" is available which determines
+## the spacing between labels on a contour to be specified.  The default is
+## 144 points, or 2 inches.
 ##
 ## The optional return value @var{h} is a vector of graphics handles to
 ## the text objects representing each label.  
@@ -57,6 +62,7 @@
 ## @end deftypefn
 
 function retval = clabel (c, varargin)
+
   label_spacing = 2 * 72;
   have_hg = false;
   have_labelspacing = false;