docs: update pairfloes docstring

[cpaniaguam]

Add argument latlonrefimage

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ec0c674) 90.73% compared to head (b9ceaee) 90.73%.
Report is 3 commits behind head on main.

❗ Current head b9ceaee differs from pull request most recent head e2367f5. Consider uploading reports for the commit e2367f5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #355   +/-   ##
=======================================
  Coverage   90.73%   90.73%           
=======================================
  Files          29       29           
  Lines         950      950           
=======================================
  Hits          862      862           
  Misses         88       88           

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