[AIRFLOW-XXXX] Update operation chaining documentation (#7018)
[AIRFLOW-XXXX] Update operation chaining documentation (#7018)


(cherry picked from commit e7401730a241e6a5c4c2b7c9360243c74fda2133)

owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow