Document that batchCheck does not preserve order

[aaguiarz]

Checklist

• [X] I agree to the terms within the OpenFGA Code of Conduct.

Describe the problem you'd like to have solved

We should clarify in the documentation that batchCheck does not preserve the order

Describe the ideal solution

We should clarify in the documentation that batchCheck does not preserve the order

Alternatives and current workarounds

No response

References

No response

Additional context

No response