Update error message as suggested by code review
Update error message
as suggested by code review

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