
**Apache Airflow version**:
1.10.13

**What happened**:
`force_logout_after` should be `force_log_out_after` in the code section https://github.com/apache/airflow/blob/master/airflow/settings.py#L372-L381. As `force_log_out_after` is actually used and written in https://github.com/apache/airflow/blob/c5700a56bb3b9a5b872bda0fe0d3de82b0128bdf/UPDATING.md#unify-user-session-lifetime-configuration.

**What you expected to happen**:
`force_logout_after` is renamed to `force_log_out_after`.
airflow/settings.py
"""Properly close pooled database connections"""
    log.debug("Disposing DB connection pool (PID %s)", os.getpid())
    global engine
    global Session
    if Session:
        Session.remove()
        Session = None
    if engine:
        engine.dispose()
        engine = None
def configure_adapters():
    """Register Adapters and DB Converters"""
    from pendulum import DateTime as Pendulum
    try:
        from sqlite3 import register_adapter
        register_adapter(Pendulum, lambda val: val.isoformat(' '))
    except ImportError:
        pass
    try:
        import MySQLdb.converters
        MySQLdb.converters.conversions[Pendulum] = MySQLdb.converters.DateTime2literal
    except ImportError:
        pass
    try:
        import pymysql.converters
        pymysql.converters.conversions[Pendulum] = pymysql.converters.escape_datetime
    except ImportError:
        pass
def validate_session():