SAS DOC update - add documentation for sas_read(format='sas7bdat')#16420

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TomAugspurger merged 2 commits intopandas-dev:masterfrom

economy:sas_doc_update

May 22, 2017

Commits on May 22, 2017

updating comparison_with_sas.rst to include documentation for reading sas7bdat format
economy
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DOC: update docs for read_sas(format='sas7bdat') #12700
economy
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