Add docs on how the runtime resolve symbols for recursive functions.
Add docs on how the runtime resolve symbols for recursive functions.

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