Fix: Sphinx doctest internal/task.py

[gogetron]

Summary

🎯 Purpose: Fix doctest in cleanlab/datalab/internal/task.py to be compatible with sphinx

[ ✏️ Write your summary here. ]

The output of cd docs && make doctest produces 10 fewer errors with this PR compared with current version.
In addition python3 -m doctest cleanlab/datalab/internal/task.py produces no errors.

Testing

🔍 Testing Done: Existing test suite, python3 -m doctest cleanlab/datalab/internal/task.py and cd docs && make doctest.

Links to Relevant Issues or Conversations

#1092

References

Reviewer Notes

💡 Include any specific points for the reviewer to consider during their review.

I would like to keep working on fixing the remaining failing doctest, so let me know if a different style is preferred when working on them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.20%. Comparing base (0221f8b) to head (79ffd80).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1097      +/-   ##
==========================================
+ Coverage   96.18%   96.20%   +0.02%     
==========================================
  Files          76       76              
  Lines        5996     6015      +19     
  Branches      992     1000       +8     
==========================================
+ Hits         5767     5787      +20     
  Misses        135      135              
+ Partials       94       93       -1     

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