Hello,

In Airflow 2, we've moved some configuration options to the new section. We also changed the names of some of the configuration options. This is confusing for users who are familiar with the old option and section names.  It would be great if we could add information to the documentation that points to the new name of the options.

https://github.com/apache/airflow/blob/8f48f12128e0d985c6de2603902524859fecbca8/airflow/configuration.py#L139-L169

> 'The {old} option in [{section}] has been renamed to {new}
> 'The {old_key} option in [{old_section}] has been moved to the {new_key} option in '
> '[{new_section}]

Best regards,
Kamil Breguła

tests/core/test_configuration.py
cfg_dict = conf.as_dict(include_env=False, display_sensitive=True)
        
        
        assert 'testsection' not in cfg_dict
    def test_command_precedence(self):
        test_config = '''[test]
key1 = hello
key2_cmd = printf cmd_result
key3 = airflow
key4_cmd = printf key4_result
'''
        test_config_default = '''[test]
key1 = awesome
key2 = airflow
[another]
key6 = value6
'''
        test_conf = AirflowConfigParser(default_config=parameterized_config(test_config_default))
        test_conf.read_string(test_config)
        test_conf.sensitive_config_values = test_conf.sensitive_config_values | {
            ('test', 'key2'),
            ('test', 'key4'),
        }
        assert 'hello' == test_conf.get('test', 'key1')
        assert 'cmd_result' == test_conf.get('test', 'key2')
        assert 'airflow' == test_conf.get('test', 'key3')