Update EXAMPLES.md so that resWithCombinedHeaders accounts for chunked cookies

[eliw00d]

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

📋 Changes

I ran into an issue where one of the examples was not accounting for multiple set-cookie headers in authRes which led to appSession.1 not being present and so the middleware was unable to decode the JWE using only appSession.0. This might be very specific to my use case where I was upgrading to v4 from v3 and using this example to help with getAccessToken being used in some getServerSideProps functions.

📎 References

🎯 Testing

After running into this issue I changed the example code to copy all other headers and then copy all cookies to resWithCombinedHeaders and no longer ran into the issue.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.08%. Comparing base (c4b3361) to head (115fce3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2503   +/-   ##
=======================================
  Coverage   90.08%   90.08%           
=======================================
  Files          68       68           
  Lines        8209     8209           
  Branches     1759     1758    -1     
=======================================
  Hits         7395     7395           
  Misses        802      802           
  Partials       12       12           

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