Add description to contributor_aggregate_ytd

[hcaofec]

Summary (required)

• Resolves Consider changing contributor_aggregate_ytd #5765

Add description to contributor_aggregate_ytd

Required reviewers

1 dev

How to test

1. Download feature branch
2. Run pytest
3. Start API on local, and test with these endpoints. Scroll down and click on model to check the description.
4. Schedule A endpoint, check contributor_aggregate_ytd
   http://127.0.0.1:5000/developers/#/receipts/get_v1_schedules_schedule_a_

5. Election endpoint, check these two fields in model
   candidate_pcc_id
candidate_pcc_name
   http://127.0.0.1:5000/developers/#/financial/get_v1_elections_

6. /v1/totals/by_entity/, check end_date
   http://127.0.0.1:5000/developers/#/financial/get_v1_totals_by_entity_

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.49%. Comparing base (4420c97) to head (5df232a).
Report is 9 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6105      +/-   ##
===========================================
+ Coverage    88.47%   88.49%   +0.02%     
===========================================
  Files           82       82              
  Lines         9142     9146       +4     
===========================================
+ Hits          8088     8094       +6     
+ Misses        1054     1052       -2     

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[fec-jli]

It looks good. Thanks