Adding documentation for the sum with axis implementation.
Adding documentation for the sum with axis implementation.

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