More updates to grizzly User's Guide

Author: xylar

docs/users_guide/machines/grizzly.rst

@@ -131,13 +131,7 @@ To build the MPAS model with
 
 .. code-block:: bash
 
-    make CORE=landice gfortran
-
-or
-
-.. code-block:: bash
-
-    make CORE=ocean gfortran
+    make gfortran
 
 grizzly, intel
 --------------
@@ -153,10 +147,4 @@ To build the MPAS model with
 
 .. code-block:: bash
 
-    make CORE=landice intel-mpi
-
-or
-
-.. code-block:: bash
-
-    make CORE=ocean intel-mpi
+    make intel-mpi