### Describe the issue with documentation

`BaseOperator` type hints for `retry_delay` and `max_retry_delay` shows `timedelta` only, however the params also accept `float` seconds values.
Also, type hint for `dag` param is missing.
More precise type hints and params descriptions in the docs can help to understand the code behavior easier.

### How to solve the problem

_No response_

### Anything else

_No response_

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

airflow/models/baseoperator.py
"""Required by TaskMixin"""
        return [self]
    def _set_relatives(
        self,
        task_or_task_list: Union[TaskMixin, Sequence[TaskMixin]],
        upstream: bool = False,
        edge_modifier: Optional[EdgeModifier] = None,
    ) -> None:
        """Sets relatives for the task or task list."""
        if not isinstance(task_or_task_list, Sequence):
            task_or_task_list = [task_or_task_list]
        task_list: List["BaseOperator"] = []
        for task_object in task_or_task_list:
            task_object.update_relative(self, not upstream)
            relatives = task_object.leaves if upstream else task_object.roots
            task_list.extend(relatives)
        for task in task_list:
            if not isinstance(task, BaseOperator):
                raise AirflowException(
                    f"Relationships can only be set between Operators; received {task.__class__.__name__}"
                )
        
        
        dags = {
            task._dag.dag_id: task._dag for task in self.roots + task_list if task.has_dag()  
        }
        if len(dags) > 1:
            raise AirflowException(
                f'Tried to set relationships between tasks in more than one DAG: {dags.values()}'