Closes #2326 check_type documentation is updated for argument details.

[Lina2689]

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[bundfussr]

Thanks @Lina2689 - I'm just wondering if we need a test set up to make sure this is behaving appropriately?? @bundfussr WDYT??

Perhaps there is already one??

Yes, a test for the case that order is not specified and duplicates in dataset_add with respect to by_vars is a good idea.

[Lina2689]

@bundfussr & @bms63 , I have added test cases when order is not specified and also updated the description in header. Can you please review and let me know if anything needs to be updated.