Update the documentation of "Powering" in fmpz_poly
Update the documentation of "Powering" in fmpz_poly

jpflori/flint2,wbhart/flint2,fredrik-johansson/flint2,dsroche/flint2,dsroche/flint2,jpflori/flint2,jpflori/flint2,dsroche/flint2,fredrik-johansson/flint2,jpflori/flint2,wbhart/flint2,dsroche/flint2,wbhart/flint2,fredrik-johansson/flint2