Fix typos in batch_update_state docstring

[Copilot]

Corrects spelling errors in the batch_update_state method docstring introduced in #1714.

Changes:

• Fixed "scheudles" → "schedules" in method description
• Fixed "ScheudleItem" → "ScheduleItem" in parameter type annotation

def batch_update_state(self, schedules, state, update_all=False) -> list[str]:
    """
    Batch update the status of one or more schedules. If update_all is set,
    all schedules on the Tableau Server are affected.

    Parameters
    ----------
    schedules: Iterable[ScheduleItem | str] | Any
        The schedules to be updated. If update_all=True, this is ignored.
    ...

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