doc: VP solver is validated with OpenMP

When the implicit VP solver was added in f7fd063 (dynamics: add implicit
VP solver (CICE-Consortium#491), 2020-09-22), it had not yet been tested with OpenMP
enabled.

The OpenMP implementation was carefully reviewed and then fixed in
d1e972a (Update OMP (CICE-Consortium#680), 2022-02-18), which lead to all runs of the
'decomp' suite completing and all restart tests passing. The 'bfbcomp'
tests are still failing, but this is due to the code not using the CICE
global sum implementation correctly, which will be fixed in the next
commits.

Update the documentation accordingly.

doc/source/science_guide/sg_dynamics.rst

@@ -92,8 +92,7 @@ dynamics into CICE is described in detail in
 
 The VP solver implementation mostly follows :cite:`Lemieux08`, with
 FGMRES :cite:`Saad93` as the linear solver and GMRES as the preconditioner.
-Note that the VP solver has not yet been tested on the ``tx1`` grid or with
-threading enabled.
+Note that the VP solver has not yet been tested on the ``tx1`` grid.
 
 The EVP, rEVP, EAP and VP approaches are all available with the B grid. However, at the moment, only the EVP and rEVP schemes are possible with the C grid.