Quick fix for a typo in tutorials/dottest.py

[alex-rakowski]

changes:
gs = pltgs.GridSpec(1, 9) to gs = plt.GridSpec(1, 9)

[mrava87]

I think is due to the import import matplotlib.gridspec as pltgs. Perhaps nowadays it is not needed anymore to import that specific submodule, but if we do the change you suggest we should also remove import matplotlib.gridspec as pltgs. Agree?

[alex-rakowski]

I made a mistake. I didn't notice the import when I was copying and working through the example.

I could edit the pltgs import and usage as I think it's not needed anymore, but it works so maybe simplest to just leave it unchanged.