Improve Vert.x Gatway Docs [Keycloak - Security]

[volkflo]

As we do not use realm-public-key anymore we can remove it from the docs to avoid confusion.

Checklist

• I have added a changelog entry.
• If I've added a new feature/enhancement, I have added documentation for it.
• If I've made a change that requires migration, I've added an entry to the migration guide.
• I have tested this change manually, as well as as passing tests.

[cypress]

Passing run #959 ↗︎

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Details:

Merge 4601f40 into c441939...
Project: Apiman	Commit: f710e335f6 ℹ️
Status: Passed	Duration: 01:25 💡
Started: Aug 10, 2023 6:46 AM	Ended: Aug 10, 2023 6:48 AM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}