[REQ] Improve documentation for Gradle 8.0.2

Is your feature request related to a problem? Please describe.

The Gradle documentation is outdated for Gradle 8.

Describe the solution you'd like

Update the documentation to use the lazy tasks.register api instead of the deprecated methods.

def generateModelsTask = tasks.register('generateModels', GenerateTask) {
    generatorName = "java"
    inputSpec = "<inputSpec>"
    outputDir = "<outputDir>"
    modelPackage = "<package>"
    generateModelTests = false
    globalProperties.putAll([
            // force only the models
            apis    : "false",
            invokers: "false",
    ])
    configOptions.putAll([
            library             : "native",
            serializationLibrary: "jackson",
            dateLibrary         : "java8",
            useJakartaEe        : "true",
    ])
}

compileJava.dependsOn generateModelsTask

Describe alternatives you've considered

/

Additional context

https://docs.gradle.org/current/userguide/more_about_tasks.html#sec:defining_tasks

Start with the linked Gradle documentation section and search the repository documentation for task definitions using deprecated methods. Update the relevant examples to use the lazy tasks.register API shown in the issue, then verify that the examples are appropriate for Gradle 8.0.2.