add documentation for default_view in course api
add documentation for default_view in course api

closes #CNVS-5252

Change-Id: If9381589521721becb691e5715edfedd77e531d2
Reviewed-on: https://gerrit.instructure.com/19898
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>
Product-Review: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>
QA-Review: Adam Phillipps <0e18f44c1fec03ec4083422cb58ba6a09ac4fb2a@instructure.com>

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