#1577: Changed years_since documentation to match its implementation

[Taxalo]

Fixes documentation on #1577 by changing the comments on both NaiveDate and DateTime.

No tests are needed since its only comments.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.78%. Comparing base (352a352) to head (4e910dc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1578   +/-   ##
=======================================
  Coverage   91.78%   91.78%           
=======================================
  Files          37       37           
  Lines       18208    18208           
=======================================
  Hits        16713    16713           
  Misses       1495     1495           

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[pitdicker]

Thank you, good you fixed both 👍.