doc: Periodic grammarcheck of documentation. * doc/interpreter/contrib.txi, doc/interpreter/expr.txi, doc/interpreter/func.txi, doc/interpreter/linalg.txi, doc/interpreter/plot.txi, libinterp/corefcn/data.cc, libinterp/corefcn/debug.cc, libinterp/corefcn/graphics.cc, libinterp/corefcn/help.cc, libinterp/corefcn/load-save.cc, libinterp/corefcn/profiler.cc, libinterp/corefcn/syscalls.cc, libinterp/corefcn/utils.cc, libinterp/corefcn/variables.cc, libinterp/dldfcn/__init_fltk__.cc, scripts/general/deal.m, scripts/help/__gripe_missing_component__.m, scripts/miscellaneous/desktop.m, scripts/pkg/private/default_prefix.m, scripts/plot/appearance/__getlegenddata__.m, scripts/plot/util/pan.m, scripts/plot/util/rotate.m, scripts/plot/util/rotate3d.m, scripts/plot/util/zoom.m, scripts/signal/periodogram.m, scripts/specfun/factor.m, scripts/specfun/primes.m, scripts/statistics/base/lscov.m, scripts/testfun/private/compare_plot_demos.m, scripts/testfun/private/dump_demos.m, scripts/testfun/private/html_compare_plot_demos.m, scripts/testfun/test.m: Periodic grammarcheck of documentation.

--- a/doc/interpreter/plot.txi	Mon Sep 22 20:25:21 2014 -0700
+++ b/doc/interpreter/plot.txi	Mon Sep 22 20:46:54 2014 -0700
@@ -1473,6 +1473,7 @@
 and their origin is the lower left corner of the plotting area.
 
 Events which sets @qcode{"currentpoint"} are
+
 @table @asis
 @item A mouse button was pressed
 always
@@ -1588,6 +1589,7 @@
 @item selectiontype
 Holds information about the last mouse button press within the figure.
 May be one of
+
 @table @asis
 @item @qcode{"normal"}
 Left mouse button click.
@@ -1718,7 +1720,7 @@
 coordinates of the point over which the mouse pointer was when the
 mouse button was pressed in axes data units.  If a mouse callback
 function is defined, @qcode{"currentpoint"} holds the pointer
-coordinates at the time the mouse button was pressed.  For 3D plots,
+coordinates at the time the mouse button was pressed.  For 3-D plots,
 the first row of the returned matrix specifies the point nearest to
 the current camera position and the second rows the furthest point.
 The two points forms a line which is perpendicular to the screen.