Customize lint message for nzchar_linter()

[MichaelChirico]

Closes #2383

[AshesITR]

nice!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (538440d) 98.53% compared to head (99cd756) 98.54%.

❗ Current head 99cd756 differs from pull request most recent head 8bc2d23. Consider uploading reports for the commit 8bc2d23 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2420   +/-   ##
=======================================
  Coverage   98.53%   98.54%           
=======================================
  Files         125      125           
  Lines        5609     5631   +22     
=======================================
+ Hits         5527     5549   +22     
  Misses         82       82           

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[IndrajeetPatil]

Overall, this looks good! Thanks.

While you are at nzchar_linter(), can you please also update the examples to follow the same pattern we are following in other linters (parallel examples that do and don't lint)?