[Doc] pseudo code in writing-extensions guide does not match the description

[gaol]

In the writting-extensions guide[1], there is an pseudo code snippet:

quarkus/docs/src/main/asciidoc/writing-extensions.adoc

Lines 826 to 829 in 3b6f5c3

	if (capabilities.isMissing(Capability.RESTEASY_REACTIVE)
	&& capabilities.isMissing(Capability.RESTEASY_CLASSIC)) {
	validationErrors.produce(new ValidationErrorBuildItem(
	new ConfigurationException("Cannot use both RESTEasy Classic and Reactive extensions at the same time")));

to show the usage of ValidationErrorBuildItem on the deployment module, but the sentence of Cannot use both RESTEasy Classic and Reactive extensions at the same time does not match the code of isMissing() invocations, I guess they should be isPresent() for the checkings.

[1] https://quarkus.io/guides/writing-extensions#validation-error-build-item