DOC: Refactor econ docstrings to numpydoc format

[addisonlynch]

Proposed changes in this pull request for fecon236

Fix #

• [ ] Bug :bug:
• [ ] Add tests :white_check_mark:
• [ ] Performance boost :racehorse:
• [ ] Documentation change :memo:
• [ ] Removed code or file :fire:
• [ ] Security issue :lock:
• [ ] Dependency downgrade :arrow_down:
• [ ] Dependency upgrade :arrow_up:
• [ ] Enhancement :art:

Additional helpful details

• [ ] REQUIRE: PR rebased on latest develop branch
• [ ] This pull request needs to be manually tested
• [ ] Work-in-progress: more changes will follow
• [ ] Issue requires further discussion
• [ ] Issue has been fully resolved

ATTN mention: @rsvp