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
test_cmdenv_config = '''[testcmdenv]
itsacommand = NOT OK
notacommand = OK
'''
        test_cmdenv_conf = AirflowConfigParser()
        test_cmdenv_conf.read_string(test_cmdenv_config)
        test_cmdenv_conf.sensitive_config_values.add(('testcmdenv', 'itsacommand'))
        with unittest.mock.patch.dict('os.environ'):
            
            
            
            assert test_cmdenv_conf.get('testcmdenv', 'itsacommand') == 'OK'
            
            
            
            assert test_cmdenv_conf.get('testcmdenv', 'notacommand') == 'OK'
    def test_parameterized_config_gen(self):
        cfg = parameterized_config(DEFAULT_CONFIG)
        
        assert "[core]" in cfg
        assert "dags_folder" in cfg
        assert "sql_alchemy_conn" in cfg
        assert "fernet_key" in cfg
        
        assert "{AIRFLOW_HOME}" not in cfg
        assert "{FERNET_KEY}" not in cfg
    def test_config_use_original_when_original_and_fallback_are_present(self):