Extra links supported for operators coming from third-party packages:

airflow.serialization.serialized_objects.BUILTIN_OPERATOR_EXTRA_LINKS

airflow/cli/cli_parser.py
),
    GroupCommand(
        name="celery",
        help='Celery components',
        description=(
            'Start celery components. Works only when using CeleryExecutor. For more information, see '
            'https://airflow.apache.org/docs/stable/executor/celery.html'
        ),
        subcommands=CELERY_COMMANDS,
    ),
]
ALL_COMMANDS_DICT: Dict[str, CLICommand] = {sp.name: sp for sp in airflow_commands}
DAG_CLI_COMMANDS: Set[str] = {'list_tasks', 'backfill', 'test', 'run', 'pause', 'unpause', 'list_dag_runs'}
class AirflowHelpFormatter(argparse.HelpFormatter):
    """
    Custom help formatter to display help message.
    It displays simple commands and groups of commands in separate sections.
    """
    def _format_action(self, action: Action):
        if isinstance(action, argparse._SubParsersAction):  
            parts = []
            action_header = self._format_action_invocation(action)
            action_header = '%*s%s\n' % (self._current_indent, '', action_header)
            parts.append(action_header)
            self._indent()
            subactions = action._get_subactions()  
            action_subcommands, group_subcommands = partition(
                lambda d: isinstance(ALL_COMMANDS_DICT[d.dest], GroupCommand), subactions
            )
            parts.append("\n")