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
key = env_var.replace(section_prefix, '')
                if key.endswith("_CMD"):
                    key = key[:-4]
                key = key.lower()
                _section[key] = self._get_env_var_option(section, key)
        for key, val in _section.items():
            try:
                val = int(val)
            except ValueError:
                try:
                    val = float(val)
                except ValueError:
                    if val.lower() in ('t', 'true'):
                        val = True
                    elif val.lower() in ('f', 'false'):
                        val = False
            _section[key] = val
        return _section
    def write(self, fp, space_around_delimiters=True):
        
        
        if space_around_delimiters:
            delimiter = f" {self._delimiters[0]} "
        else:
            delimiter = self._delimiters[0]
        if self._defaults:
            self._write_section(fp, self.default_section, self._defaults.items(), delimiter)
        for section in self._sections:
            self._write_section(fp, section, self.getsection(section).items(), delimiter)
    def as_dict(