doc: correct description of box2001 test (#510)

The documentation states that this test case sets 'coriolis' to zero,
but 'configuration/scripts/options/set_nml.box2001' sets 'coriolis' to 'constant'.
Fix the documentation to be in line with the code.

While at it, add the correct unit for the Coriolis parameter (in both places
where it appears in the documentation).

Closes #509

Reported-by: Jean-François Lemieux <jean-francois.lemieux@canada.ca>

doc/source/user_guide/ug_case_settings.rst

@@ -364,7 +364,7 @@ dynamics_nml
    "``brlx``", "real", "revised_evp value", "300.0"
    "``basalstress``", "logical", "use basal stress parameterization for landfast ice", "``.false.``"
    "``Cf``", "real", "ratio of ridging work to PE change in ridging", "17.0"
-   "``coriolis``", "``constant``", "constant coriolis value = 1.46e-4", "``latitude``"
+   "``coriolis``", "``constant``", "constant coriolis value = 1.46e-4 s\ :math:`^{-1}`", "``latitude``"
    "", "``latitude``", "coriolis variable by latitude", ""
    "", "``zero``", "zero coriolis", ""
    "``Cstar``", "real", "constant in Hibler strength formula", "20"

doc/source/user_guide/ug_testing.rst

@@ -228,7 +228,7 @@ boundary around the entire domain.  It includes the following namelist modificat
 - ``dxrect``: ``16.e5`` cm
 - ``dyrect``: ``16.e5`` cm
 - ``ktherm``: ``-1`` (disables thermodynamics)
-- ``coriolis``: ``zero`` (zero coriolis force)
+- ``coriolis``: ``constant`` (``f=1.46e-4`` s\ :math:`^{-1}`)
 - ``ice_data_type`` : ``box2001`` (special ice concentration initialization)
 - ``atm_data_type`` : ``box2001`` (special atmospheric and ocean forcing)