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Clarify comment RE optimising early exit in loop checking
string kind in `unicode_getitem`.

IntelLabs/numba,IntelLabs/numba,stuartarchibald/numba,seibert/numba,cpcloud/numba,numba/numba,stonebig/numba,cpcloud/numba,gmarkall/numba,seibert/numba,stonebig/numba,seibert/numba,IntelLabs/numba,numba/numba,stuartarchibald/numba,cpcloud/numba,numba/numba,IntelLabs/numba,numba/numba,numba/numba,stuartarchibald/numba,IntelLabs/numba,seibert/numba,seibert/numba,stuartarchibald/numba,cpcloud/numba,stonebig/numba,stonebig/numba,gmarkall/numba,stuartarchibald/numba,gmarkall/numba,gmarkall/numba,stonebig/numba,cpcloud/numba,gmarkall/numba