Updated documentation for Displaying/Exporting (#479)
Updated documentation for Displaying/Exporting (#479)

* Updated documentation for Displaying/Exporting

Added documentations for the methods show(), as_html() and index_by() for displaying or exporting a Table.

Co-authored-by: Adnan Hemani <6bf41fd3f2f62ac780952e9aebb607371e02054a@berkeley.edu>, CodTan
data-8/datascience