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
return optionstr
    def __init__(self, default_config=None, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.airflow_defaults = ConfigParser(*args, **kwargs)
        if default_config is not None:
            self.airflow_defaults.read_string(default_config)
        self.is_validated = False
    def validate(self):
        self._validate_config_dependencies()
        for section, replacement in self.deprecated_values.items():
            for name, info in replacement.items():
                old, new, version = info
                current_value = self.get(section, name, fallback=None)
                if self._using_old_value(old, current_value):
                    new_value = re.sub(old, new, current_value)
                    self._update_env_var(section=section, name=name, new_value=new_value)
                    self._create_future_warning(
                        name=name,
                        section=section,
                        current_value=current_value,
                        new_value=new_value,
                        version=version,
                    )
        self.is_validated = True
    def _validate_config_dependencies(self):