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/stem.m
+++ b/scripts/plot/stem.m
@@ -21,10 +21,10 @@
 ## @deftypefnx {Function File} {} stem (@var{x}, @var{y})
 ## @deftypefnx {Function File} {} stem (@dots{}, @var{linespec})
 ## @deftypefnx {Function File} {} stem (@dots{}, "filled")
-## @deftypefnx {Function File} {} stem (@dots{}, "@var{prop}", "@var{val}", @dots{})
+## @deftypefnx {Function File} {} stem (@dots{}, @var{prop}, @var{val}, @dots{})
 ## @deftypefnx {Function File} {} stem (@var{hax}, @dots{})
 ## @deftypefnx {Function File} {@var{h} =} stem (@dots{})
-## Plot a stem graph from two vectors of x-y data.
+## Plot a 2-D stem graph.
 ##
 ## If only one argument is given, it is taken as the y-values and the
 ## x-coordinates are taken from the indices of the elements.
@@ -37,7 +37,8 @@
 ## The default color is @code{"b"} (blue), the default line style is
 ## @code{"-"}, and the default marker is @code{"o"}.  The line style can
 ## be altered by the @code{linespec} argument in the same manner as the
-## @code{plot} command.  For example,
+## @code{plot} command.  If the "filled" argument is present the markers at
+## the top of the stems will be filled in.  For example,
 ##
 ## @example
 ## @group
@@ -50,11 +51,11 @@
 ## @noindent
 ## plots 10 stems with heights from 2 to 20 in red;
 ##
-## Multiple property/value pairs may be specified, but they must appear in
-## pairs.
+## Optional property/value pairs may be specified to control the appearance
+## of the plot.
 ##
-## If the first argument @var{hax} is an axis handle, then plot into these axes,
-## rather than the current axis handle returned by @code{gca}.
+## 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 vector of "stem series" graphics
 ## handles with one handle per column of the variable @var{y}.  The
@@ -75,7 +76,7 @@
 ## @noindent
 ## changes the color of the second "stem series" and moves the base line
 ## of the first.
-## @seealso{stem3, bar, hist, plot}
+## @seealso{stem3, bar, hist, plot, stairs}
 ## @end deftypefn
 
 ## Author: Michel D. Schmid <michaelschmid@users.sourceforge.net>