[AIRFLOW-3175] Fix docstring format in airflow/jobs.py (#4025)
[AIRFLOW-3175] Fix docstring format in airflow/jobs.py (#4025)

These docstrings could not parsed properly in Sphinx syntax
owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow