Document more of the low-level API
Document more of the low-level API

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