Fix code sample in documentation

Backport of c2e8ef0

Author: fmbenhassine

spring-batch-docs/asciidoc/job.adoc

@@ -1657,7 +1657,8 @@ The following example shows a typical bean definition for `SimpleJobOperator` in
  @Bean
  public SimpleJobOperator jobOperator(JobExplorer jobExplorer,
                                 JobRepository jobRepository,
-                                JobRegistry jobRegistry) {
+                                JobRegistry jobRegistry,
+                                JobLauncher jobLauncher) {
 
 	SimpleJobOperator jobOperator = new SimpleJobOperator();