Fix example comment in JibExtension
The example comment uses `exposedPorts` to define which ports the container should expose, the `ContainerParameters` class does not have such a property. The correct property name is `ports`.
@@ -52,7 +52,7 @@ import org.gradle.api.tasks.Optional;
* jvmFlags = ['-Xms512m', '-Xdebug']
* mainClass = 'com.mycompany.myproject.Main'
* args = ['arg1', 'arg2']
- * exposedPorts = ['1000', '2000-2010', '3000']
+ * ports = ['1000', '2000-2010', '3000']
* format = OCI
* appRoot = '/app'
* }
