fix: vale configuration for examples

[jorgepiloto]

Fix issue #406 ensuring that documentation style applies in example files.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.58%. Comparing base (eb1184a) to head (ef149fd).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1034   +/-   ##
=======================================
  Coverage   89.58%   89.58%           
=======================================
  Files          67       67           
  Lines      190995   190995           
  Branches     1428     1428           
=======================================
+ Hits       171106   171108    +2     
+ Misses      19474    19472    -2     
  Partials      415      415           

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