Update MLE.md chapter

[rickecon]

• make documentation, make format, and make test have been run locally on my machine.

This PR:

• Updates the MLE.md maximum likelihood chapter

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (66afef4) 65.89% compared to head (3d5265f) 65.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #24   +/-   ##
=======================================
  Coverage   65.89%   65.89%           
=======================================
  Files           4        4           
  Lines         129      129           
=======================================
  Hits           85       85           
  Misses         44       44           

Flag	Coverage Δ
unittests	65.89% <ø> (ø)

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