fix: correct example format for tags in Pet struct

[vikyw89]

Fixes #857

[danielgtaylor]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.56%. Comparing base (df27bef) to head (77094e0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #858   +/-   ##
=======================================
  Coverage   92.56%   92.56%           
=======================================
  Files          23       23           
  Lines        5511     5511           
=======================================
  Hits         5101     5101           
  Misses        351      351           
  Partials       59       59           

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