changed CNLF to CNLF2

Author: cwittens

docs/src/solvers/split_ode_solve.md

@@ -30,7 +30,7 @@ the problem, though for large enough PDEs the `ARKODE` method with
   - `IMEXEuler` : 1st order explicit Euler mixed with implicit Euler. Fixed time
     step only.
   - `CNAB2`: Crank-Nicolson Adams Bashforth Order 2. Fixed time step only.
-  - `CNLF`: Crank-Nicolson Leapfrog of Order 2. Fixed time step only.
+  - `CNLF2`: Crank-Nicolson Leapfrog of Order 2. Fixed time step only.
   - `SBDF2` : 2nd order IMEX BDF method. Fixed time step only.
   - `SBDF3` : 3rd order IMEX BDF method. Fixed time step only. In development.
   - `SBDF4` : 4th order IMEX BDF method. Fixed time step only. In development.