Fix documentation of providers field of REST Client

[geoand]

• Fixes: Incorrect documentation of configuration for REST client providers #45068

[github-actions]

🎊 PR Preview 89276df has been successfully built and deployed to https://quarkus-pr-main-45080-preview.surge.sh/version/main/guides/

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[quarkus-bot]

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

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[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 167327f.

✅ 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.

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Flaky tests - Develocity

⚙️ JVM Tests - JDK 17

📦 integration-tests/opentelemetry-vertx-exporter

✖ io.quarkus.it.opentelemetry.vertx.exporter.grpc.SimpleGrpcNoTLSWithCompressionTest.test - History

• Assertion condition defined as a Lambda expression in io.quarkus.it.opentelemetry.vertx.exporter.AbstractExporterTest Expecting Optional to contain a value but it was empty within 30 seconds. - org.awaitility.core.ConditionTimeoutException

org.awaitility.core.ConditionTimeoutException: 
Assertion condition defined as a Lambda expression in io.quarkus.it.opentelemetry.vertx.exporter.AbstractExporterTest 
Expecting Optional to contain a value but it was empty within 30 seconds.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.AssertionCondition.await(AssertionCondition.java:119)
	at org.awaitility.core.AssertionCondition.await(AssertionCondition.java:31)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:1006)
	at org.awaitility.core.ConditionFactory.untilAsserted(ConditionFactory.java:790)

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⚙️ JVM Tests - JDK 21

📦 extensions/opentelemetry/deployment

✖ io.quarkus.opentelemetry.deployment.traces.OpenTelemetrySpanSecurityEventsTest.testSecurityEventTypes - History

• event executor terminated - java.util.concurrent.RejectedExecutionException

java.util.concurrent.RejectedExecutionException: event executor terminated
	at io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:934)
	at io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:353)
	at io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:346)
	at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:836)
	at io.netty.util.concurrent.SingleThreadEventExecutor.execute0(SingleThreadEventExecutor.java:827)
	at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:817)
	at io.vertx.core.impl.EventLoopExecutor.execute(EventLoopExecutor.java:35)