Editorial: Change MonthDay to PlainMonthDay in TemporalMonthDayToString

[trflynn89]

No description provided.

[ptomato]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.71%. Comparing base (d17b98f) to head (1a3297d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3044   +/-   ##
=======================================
  Coverage   95.71%   95.71%           
=======================================
  Files          21       21           
  Lines        9704     9704           
  Branches     1742     1742           
=======================================
  Hits         9288     9288           
  Misses        364      364           
  Partials       52       52           

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