Updating documentation to include references to AssignmentOverride an…

[lafent]

…d to display functionality of same.

Proposed Changes

• This adds a reference to the autoclass for Assignments to pull in the AssignmentOverride details
• Also adds a line break to the assignments.py docstrings so they parse properly (same structure used in AssignmentGroup.

Fixes # .

[codecov[bot]]

Codecov Report

Merging #575 (4e94e49) into develop (c8c7f4b) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##           develop      #575   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           72        72           
  Lines         3672      3672           
=========================================
  Hits          3672      3672           

Impacted Files	Coverage Δ
canvasapi/assignment.py	100.00% <ø> (ø)

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