Remove some out-of-date restrictions and clarify some wording.
Remove some out-of-date restrictions and clarify some wording.

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