Remove tokenCache documentation and examples

[jhrozek]

Remove stale tokenCache references from documentation and examples that were missed in the TokenCache configuration removal.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.48%. Comparing base (80ebee6) to head (de5c61a).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2801      +/-   ##
==========================================
- Coverage   56.49%   56.48%   -0.01%     
==========================================
  Files         319      319              
  Lines       30954    30854     -100     
==========================================
- Hits        17487    17429      -58     
+ Misses      11962    11931      -31     
+ Partials     1505     1494      -11     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.