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/caxis.m
+++ b/scripts/plot/caxis.m
@@ -26,8 +26,8 @@
 ## colormap.  Values outside this range are clamped to the first and last
 ## colormap entries.
 ##
-## If @var{limits} is 'auto', then automatic colormap scaling is applied,
-## whereas if @var{limits} is 'manual' the colormap scaling is set to manual.
+## If @var{limits} is "auto", then automatic colormap scaling is applied,
+## whereas if @var{limits} is "manual" the colormap scaling is set to manual.
 ##
 ## Called without any arguments to current color axis limits are returned.
 ##