Improve arch doc
Improve arch doc

numba/numba,ssarangi/numba,ssarangi/numba,pitrou/numba,numba/numba,stuartarchibald/numba,pitrou/numba,GaZ3ll3/numba,cpcloud/numba,gmarkall/numba,stuartarchibald/numba,gdementen/numba,IntelLabs/numba,sklam/numba,gdementen/numba,jriehl/numba,sklam/numba,gdementen/numba,sklam/numba,ssarangi/numba,stonebig/numba,cpcloud/numba,stonebig/numba,pitrou/numba,stefanseefeld/numba,jriehl/numba,pombredanne/numba,numba/numba,gmarkall/numba,IntelLabs/numba,numba/numba,jriehl/numba,pombredanne/numba,stuartarchibald/numba,cpcloud/numba,cpcloud/numba,stuartarchibald/numba,gdementen/numba,ssarangi/numba,GaZ3ll3/numba,seibert/numba,IntelLabs/numba,numba/numba,gmarkall/numba,gdementen/numba,pombredanne/numba,stonebig/numba,stefanseefeld/numba,stefanseefeld/numba,sklam/numba,sklam/numba,GaZ3ll3/numba,seibert/numba,stefanseefeld/numba,seibert/numba,cpcloud/numba,GaZ3ll3/numba,pitrou/numba,gmarkall/numba,pombredanne/numba,jriehl/numba,stuartarchibald/numba,GaZ3ll3/numba,gmarkall/numba,pombredanne/numba,pitrou/numba,stonebig/numba,IntelLabs/numba,IntelLabs/numba,seibert/numba,jriehl/numba,seibert/numba,stefanseefeld/numba,ssarangi/numba,stonebig/numba