Update docstrings for new functions

[mdeceglie]

• ~Code changes are covered by tests~
• ~Code changes have been evaluated for compatibility/integration with TrendAnalysis~
• [x] New functions added to __init__.py
• [x] API.rst is up to date, along with other sphinx docs pages
• ~Example notebooks are rerun and differences in results scrutinized~
• ~Updated changelog~

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.25%. Comparing base (8d67b24) to head (ff53213).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## aggregated_filters_for_trials #418 +/- ## ================================================================= + Coverage 75.11% 75.25% +0.14% ================================================================= Files 13 13 Lines 2825 2825 ================================================================= + Hits 2122 2126 +4 + Misses 703 699 -4 ```

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