docs(expect): add examples of matcher usages

[kt3k]

closes #5544

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.48%. Comparing base (f7561ca) to head (6ab6ec1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5553   +/-   ##
=======================================
  Coverage   96.48%   96.48%           
=======================================
  Files         465      465           
  Lines       37772    37772           
  Branches     5580     5580           
=======================================
  Hits        36445    36445           
  Misses       1285     1285           
  Partials       42       42           

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