TYP: changed variable cat_array to cat_array_list in dtypes.py and arr_list in categorical.py
xref #37715

My apologies, I pushed hastily on my previous branch assign_err and did not check the diff of the files i was pushing. I accidentally pulled when i should have merged and I pushed a bunch of other peoples commits.  These are my previous changes.
umm what are these in reference to? @jreback #44373 thanks @nickleus27 