Add section about sublattice.get_polarization_from_second_sublattice

1 job from master in 13 minutes (queued for 26 seconds)
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Status Job ID Name Coverage
  Test
failed #128274792
test_non_release_branches

00:13:00

 
Name Stage Failure
failed
test_non_release_branches Test
NameError                                 Traceback (most recent call last)
<ipython-input-44-693a5caa8960> in <module>()
----> 1 s_polarization.plot()
2 vector_list = s_polarization.metadata.vector_list

NameError: name 's_polarization' is not defined

=============== 3 failed, 41 passed, 1 skipped in 409.68 seconds ===============
ERROR: Job failed: exit code 1