Fix typo in section title

This typo was causing that the section title wasn't rendered as
expected. It happens since boot 2.5.0, as can be checked in
https://docs.spring.io/spring-boot/docs/2.5.0/reference/htmlsingle/#howto.batch.running-jobs-on-startup

spring-boot-project/spring-boot-docs/src/docs/asciidoc/howto/batch.adoc

@@ -29,7 +29,7 @@ See {spring-boot-autoconfigure-module-code}/batch/BatchAutoConfiguration.java[Ba
 
 
 
-[[howto.batch.?running-from-the-command-line]]
+[[howto.batch.running-from-the-command-line]]
 === Running from the Command Line
 Spring Boot converts any command line argument starting with `--` to a property to add to the `Environment`, see <<features#features.external-config.command-line-args,accessing command line properties>>.
 This should not be used to pass arguments to batch jobs.