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

airflow/configuration.py
"""Get Config option values from Secret Backend"""
        fallback_key = key + '_secret'
        
        if (section, key) in self.sensitive_config_values:
            if super().has_option(section, fallback_key):
                secrets_path = super().get(section, fallback_key)
                return _get_config_value_from_secret_backend(secrets_path)
        return None
    def get(self, section, key, **kwargs):
        section = str(section).lower()
        key = str(key).lower()
        deprecated_section, deprecated_key = self.deprecated_options.get((section, key), (None, None))
        option = self._get_environment_variables(deprecated_key, deprecated_section, key, section)
        if option is not None:
            return option
        option = self._get_option_from_config_file(deprecated_key, deprecated_section, key, kwargs, section)
        if option is not None:
            return option
        option = self._get_option_from_commands(deprecated_key, deprecated_section, key, section)
        if option is not None:
            return option
        option = self._get_option_from_secrets(deprecated_key, deprecated_section, key, section)
        if option is not None:
            return option
        return self._get_option_from_default_config(section, key, **kwargs)
    def _get_option_from_default_config(self, section, key, **kwargs):