docs: add onChange documentation in dev guidelines

[sarahgm]

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Latest commit: 0782c82

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (05c158f) 99.82% compared to head (0782c82) 99.82%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3643   +/-   ##
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  Coverage   99.82%   99.82%           
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  Files         119      119           
  Lines        6322     6322           
  Branches      301      301           
=======================================
  Hits         6311     6311           
  Misses         10       10           
  Partials        1        1