Fix grammar and clarity in use case examples

[stephwon]

fixed spelling, should be singular (sample) not plural

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.40%. Comparing base (ae95ab1) to head (0e4662a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #151   +/-   ##
=======================================
  Coverage   51.40%   51.40%           
=======================================
  Files          11       11           
  Lines        1171     1171           
=======================================
  Hits          602      602           
  Misses        569      569           

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