(impact: medium) Improved Documentation for grid pagination key

[juanmendes]

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Description

Posting on behalf of @mslavov and a few others

It would be great if the example includes how to provide the paginationTranslationKey as the format needs to be specific like {firstItem} - {lastItem} of {totalItems}

Alternatively, there could also be a way to pass the full translation yourself... that requires more work on callers since they have to retrieve the current page, total page count, total count.

Impact

Figuring out the format took me some code digging, this should be clearly specified in its API