Update Documentation to clarify Namelist Inputs

doc/source/cice_index.rst

@@ -5,12 +5,13 @@
 Index of primary variables and parameters 
 ==========================================
 
-This index defines many of the symbols used frequently in the CICE model
-code.  Namelist variables are partly included here but also documented
-elsewhere, see Section :ref:`tabnamelist`. All
-quantities in the code are expressed in MKS units (temperatures may take
+This index defines many (but not all) of the symbols used frequently in the CICE model
+code.  All quantities in the code are expressed in MKS units (temperatures may take
 either Celsius or Kelvin units).  Deprecated parameters are listed at the end.
 
+Namelist variables are partly included here, but they are fully documented in 
+section :ref:`tabnamelist`. 
+
 .. csv-table:: *Alphabetical Index*
    :header: " ", " ", " "
    :widths: 15, 30, 15, 1   

doc/source/user_guide/ug_case_settings.rst

@@ -2,8 +2,8 @@
 
 .. _case_settings:
 
-Case Settings
-=====================
+Model Namelist, CPPs, and Other Settings
+==========================================
 
 There are two important files that define the case, **cice.settings** and 
 **ice_in**.  **cice.settings** is a list of env variables that define many
@@ -130,7 +130,7 @@ can be modified as needed.
 .. _tabnamelist:
 
 
-Table of namelist options
+Tables of Namelist Inputs
 -------------------------------
 
 CICE reads a namelist input file, **ice_in**, consisting of several namelist groups.  The tables below