Minor doc issues seen from running QPU

[astaley]

Chris and I have been walking through the instructions as a double check. I noticed two things:

1. In the T2 Ramsey section we are missing instructions to from pyquil.plots import T2RamseyModel
2. Also, in the box:

   
   x, y = res_ramsey.decode()
   fit_n_data = model.report_fit(np.asarray(x), np.asarray(y))
   fit, data = (fit_n_data[0], fit_n_data[1:])
   fit.plot()
   plt.show()
   print fit.fit_report()```
   The
   ```fit.plot(); plt.show()```
   actually does not work. I had to use
   ```fig=fit.plot(); fig[0].show()```

And we should add a note to use the https:\\job.rigetti.com\beta endpoint

[astaley]

This has now been fixed with the above merge.