fixes for grid.m

[Doug Stewart]

I am running Ubuntu and installed mercurial system and then cloned Octave
So I am sure that I have the latest version of grid.m

I then made my changes and did a diff  --- see file

The changes are needed because the minor grid did not work
grid("minor","on") did not work because nargs was restricted to 1.

I hope this is the way I should submit fixes.


Doug Stewart
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