Remove deprecated CDN resource from example

[blampe]

https://learn.microsoft.com/en-us/answers/questions/5516682/migration-from-azure-cdn-classic-to-front-door

Fixes #4268.
Fixes #4265.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.78%. Comparing base (22afc25) to head (4d22a1a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4272   +/-   ##
=======================================
  Coverage   58.78%   58.78%           
=======================================
  Files          84       84           
  Lines       13582    13582           
=======================================
  Hits         7984     7984           
  Misses       4991     4991           
  Partials      607      607           

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[pulumi-bot]

This PR has been shipped in release v3.8.0.