fix: add doc to raw_id_fields for SlideSubmissionAdmin

[jennifer-richards]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.81%. Comparing base (70bf2ae) to head (c4ab55b).
Report is 37 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8687      +/-   ##
==========================================
- Coverage   88.88%   88.81%   -0.07%     
==========================================
  Files         312      314       +2     
  Lines       40891    41243     +352     
==========================================
+ Hits        36345    36629     +284     
- Misses       4546     4614      +68     

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