SIS import API docs: some args optional
SIS import API docs: some args optional

Change-Id: I2c4998098a28e43d9de1ca1ad524b1a7ecf97bc5
Reviewed-on: https://gerrit.instructure.com/25393
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Eric Adams <5108e8d39c3daf832a5d5b01c70727c22a362224@instructure.com>
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Product-Review: Adam Phillipps <0e18f44c1fec03ec4083422cb58ba6a09ac4fb2a@instructure.com>
QA-Review: Adam Phillipps <0e18f44c1fec03ec4083422cb58ba6a09ac4fb2a@instructure.com>

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