docs: Update TokenDialect option details in go-auth0 documentation

[developerkunal]

🔧 Changes

• docs: Update TokenDialect option details in go-auth0 documentation

📝 Checklist

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.37%. Comparing base (7221b14) to head (9ca45cc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #414 +/- ## ======================================= Coverage 95.37% 95.37% ======================================= Files 47 47 Lines 7614 7614 ======================================= Hits 7262 7262 Misses 235 235 Partials 117 117 ```

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