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

docs/conf.py
PACKAGE_VERSION = 'master'
os.environ['AIRFLOW_PACKAGE_NAME'] = PACKAGE_NAME
if PACKAGE_DIR:
    os.environ['AIRFLOW_PACKAGE_DIR'] = PACKAGE_DIR
os.environ['AIRFLOW_PACKAGE_VERSION'] = PACKAGE_VERSION
os.environ['BUILDING_AIRFLOW_DOCS'] = 'TRUE'
project = PACKAGE_NAME
version = PACKAGE_VERSION
release = PACKAGE_VERSION
extensions = [
    'provider_init_hack',
    'sphinx.ext.autodoc',
    'sphinx.ext.viewcode',
    'sphinxarg.ext',
    'sphinx.ext.intersphinx',
    'exampleinclude',
    'docroles',
    'removemarktransform',
    'sphinx_copybutton',
    'airflow_intersphinx',
    "sphinxcontrib.spelling",
    'sphinx_airflow_theme',
    'redirects',
]
if PACKAGE_NAME == 'apache-airflow':
    extensions.extend(
        [
            'sphinxcontrib.jinja',
            'sphinx.ext.graphviz',
            'sphinxcontrib.httpdomain',