Passing an empty string through this parameter is not gracefully handled by the module implementation, so adjust the documentation to only include the `PT0S` method of specifying unbounded `execution_time_limit`. The win_scheduled_task execution_time_limit must be set explicitly to an empty string to permit unbounded execution time.
A newly created task without a value for `TaskSettings.ExecutionTimeLimit` will default to 72 hours (https://docs.microsoft.com/en-us/windows/win32/taskschd/tasksettings-executiontimelimit) even if you omit the Ansible task parameter `execution_time_limit`.
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