Update documentation to remind how JobParameters should be specified

See gh-15081

Author: nishantraut

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

@@ -2378,6 +2378,8 @@ By default, it executes *all* `Jobs` in the application context on startup (see
 for details). You can narrow down to a specific job or jobs by specifying
 `spring.batch.job.names` (which takes a comma-separated list of job name patterns).
 
+Unlike command line option arguments (which starts with `--`, e.g. `--spring=batch`) job parameters has to be passed without dashes to job (e.g. `spring=batch`).
+
 If the application context includes a `JobRegistry`, the jobs in
 `spring.batch.job.names` are looked up in the registry instead of being autowired from the
 context. This is a common pattern with more complex systems, where multiple jobs are