Fix Javadoc in JobLauncherApplicationRunner

See gh-34596

Author: benelog

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/JobLauncherApplicationRunner.java

@@ -57,9 +57,9 @@
 import org.springframework.util.StringUtils;
 
 /**
- * {@link ApplicationRunner} to {@link JobLauncher launch} Spring Batch jobs. Runs all
- * jobs in the surrounding context by default. Can also be used to launch a specific job
- * by providing a jobName
+ * {@link ApplicationRunner} to {@link JobLauncher launch} Spring Batch jobs.
+ * If a single job is found in the context, it will be executed by default.
+ * If multiple jobs are found, launch a specific job by providing a jobName
  *
  * @author Dave Syer
  * @author Jean-Pierre Bergamin