doc: Use Octave preference for double quote in docstrings in scripts/ * interp1.m, interp2.m, interp3.m, interpn.m, profexplore.m, profile.m, profshow.m, quadgk.m, lookfor.m, imagesc.m, bzip2.m, gzip.m, parseparams.m, pkg.m, ancestor.m, caxis.m, ezmesh.m, ezmeshc.m, ezsurf.m, ezsurfc.m, hidden.m, hold.m, patch.m, pie.m, pie3.m, quiver.m, quiver3.m, scatter3.m, uicontextmenu.m, uicontrol.m, uipanel.m, uipushtool.m, uitoggletool.m, uitoolbar.m, xlim.m, ylim.m, zlim.m, ismember.m, setxor.m, filter2.m, bicg.m, demo.m, example.m, fail.m, test.m: Use Octave preference for double quote in docstrings in scripts/ directory.

--- a/scripts/plot/hidden.m
+++ b/scripts/plot/hidden.m
@@ -21,7 +21,7 @@
 ## @deftypefnx {Function File} {} hidden ()
 ## Manipulation the mesh hidden line removal.  Called with no argument
 ## the hidden line removal is toggled.  The argument @var{mode} can be either
-## 'on' or 'off' and the set of the hidden line removal is set accordingly.
+## "on" or "off" and the set of the hidden line removal is set accordingly.
 ## @seealso{mesh, meshc, surf}
 ## @end deftypefn