fixed typo in CF4Integrator docstring (#2704) #12

Job	Run time
Python 3.10 (omp=n, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	17m 1s
Python 3.10 (omp=y, mpi=n, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	17m 1s
Python 3.10 (omp=n, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	17m 0s
Python 3.10 (omp=y, mpi=y, dagmc=n, ncrystal=n, libmesh=n, event=n vectfit=n)	16m 59s
Python 3.7 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	17m 1s
Python 3.8 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	17m 1s
Python 3.9 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	16m 58s
Python 3.11 (omp=n, mpi=n, dagmc=, ncrystal=, libmesh=, event= vectfit=)	17m 0s
Python 3.10 (omp=y, mpi=y, dagmc=y, ncrystal=, libmesh=, event= vectfit=)	17m 0s
Python 3.10 (omp=n, mpi=n, dagmc=, ncrystal=y, libmesh=, event= vectfit=)	16m 59s
Python 3.10 (omp=y, mpi=y, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	16m 59s
Python 3.10 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=y, event= vectfit=)	16m 59s
Python 3.10 (omp=y, mpi=n, dagmc=, ncrystal=, libmesh=, event=y vectfit=)	16m 59s
Python 3.10 (omp=n, mpi=y, dagmc=, ncrystal=, libmesh=, event= vectfit=y)	16m 41s
finish	0s
	3h 57m 38s

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