Various improvements for config doc generation

[gsmet]

Fixes #42374
Fixes #42370
Fixes #42379
Fixes #42371
Fixes #42372
Fixes #42452

These are just small improvements + fixes and clean up.

[quarkus-bot]

Status for workflow Quarkus Documentation CI

This is the status report for running Quarkus Documentation CI on commit 2b8bd83.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

Warning

There are other workflow runs running, you probably need to wait for their status before merging.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 2b8bd83.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

---

Flaky tests - Develocity

⚙️ JVM Tests - JDK 17

📦 extensions/hibernate-orm/deployment

✖ io.quarkus.hibernate.orm.applicationfieldaccess.PublicFieldAccessInheritanceTest.testFieldAccess - History

• Expecting actual not to be null - java.lang.AssertionError

java.lang.AssertionError: 

Expecting actual not to be null
	at io.quarkus.hibernate.orm.applicationfieldaccess.PublicFieldAccessInheritanceTest$FieldAccessEnhancedDelegate$1.assertValue(PublicFieldAccessInheritanceTest.java:132)
	at io.quarkus.hibernate.orm.applicationfieldaccess.PublicFieldAccessInheritanceTest.doTestFieldAccess(PublicFieldAccessInheritanceTest.java:91)
	at io.quarkus.hibernate.orm.applicationfieldaccess.PublicFieldAccessInheritanceTest.testFieldAccess(PublicFieldAccessInheritanceTest.java:52)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at io.quarkus.test.QuarkusUnitTest.runExtensionMethod(QuarkusUnitTest.java:499)

[gsmet]

@yrodiere @marko-bekhta the flaky test is a bit concerning here ^

[github-actions]

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