Update docstrings for new functions

[mdeceglie]

• Code changes are covered by tests
• Code changes have been evaluated for compatibility/integration with TrendAnalysis
• New functions added to __init__.py
• 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 ✅

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

Additional details and impacted files

@@                        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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[cdeline]

OK, these API changes look good to me. Thanks!