Change some comments to respond to @slevis-lmwg review

bld/namelist_files/namelist_defaults_ctsm.xml

@@ -706,7 +706,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
                   maxpft="17"        use_cn=".false."    use_crop=".false." hgrid="ne0np4CONUS.ne30x8"      >.true.</use_init_interp>
 
 <!--
-     clm5_0 physics with CAM6.0 grids...
+     clm5_0 physics with CAM6.0 grids (Duplicates the above CAM7.0 section)...
 -->
 <!-- These first five are for SP mode and CLM5.0 only -->
 <use_init_interp  use_cndv=".false." use_fates=".false." sim_year="1979" lnd_tuning_mode="clm5_0_cam6.0"
@@ -725,7 +725,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 <use_init_interp  use_cndv=".false." use_fates=".false." sim_year="2013" lnd_tuning_mode="clm5_0_cam6.0"
                   maxpft="17"        use_cn=".false."    use_crop=".false." hgrid="ne0np4CONUS.ne30x8"      >.true.</use_init_interp>
 <!--
-     clm5_1 physics with CAM6.0 grids...
+     clm5_1 physics with CAM6.0 grids (duplicates above)
 -->
 <!-- These first five are for SP mode and CLM5.1 only -->
 <use_init_interp  use_cndv=".false." use_fates=".false." sim_year="1979" lnd_tuning_mode="clm5_1_cam6.0"
@@ -1365,7 +1365,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 >lnd/clm2/initdata_map/clmi.F2000.2000-01-01.ne120pg3_mt13_simyr2000_c200728.nc
 </finidat>
 
-<!-- Present day for coupled cases at low resolution -->
+<!-- Present day for coupled cases at 1-degree or lower resolutions  -->
 <finidat hgrid="0.9x1.25"    maxpft="79"  mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
          ic_ymd="20000101" sim_year="2000" do_transient_pfts=".false."
          ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".true."
@@ -1442,7 +1442,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 >lnd/clm2/initdata_map/clmi.F2000.2000-01-01.ne120pg3_mt13_simyr2000_c200728.nc
 </finidat>
 
-<!-- Present day for coupled cases at low resolution -->
+<!-- Present day for coupled cases at 1-degree or lower resolutions  -->
 <finidat hgrid="0.9x1.25"    maxpft="79"  mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
          ic_ymd="20000101" sim_year="2000" do_transient_pfts=".false."
          ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".true."
@@ -1505,7 +1505,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 >lnd/clm2/initdata_map/clmi.F2000.2000-01-01.ne120pg3_mt13_simyr2000_c200728.nc
 </finidat>
 
-<!-- Present day for coupled cases at low resolution -->
+<!-- Present day for coupled cases at 1-degree or lower resolutions  -->
 <finidat hgrid="0.9x1.25"    maxpft="79"  mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
          ic_ymd="20000101" sim_year="2000" do_transient_pfts=".false."
          ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".true."
@@ -1572,7 +1572,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 >lnd/clm2/initdata_map/clmi.F2000.2000-01-01.ne120pg3_mt13_simyr2000_c200728.nc
 </finidat>
 
-<!-- Present day for coupled cases at low resolution -->
+<!-- Present day for coupled cases at 1-degree or lower resolutions  -->
 <finidat hgrid="0.9x1.25"    maxpft="79"  mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
          ic_ymd="20000101" sim_year="2000" do_transient_pfts=".false."
          ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".true."
@@ -1649,7 +1649,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 >lnd/clm2/initdata_map/clmi.F2000.2000-01-01.ne120pg3_mt13_simyr2000_c200728.nc
 </finidat>
 
-<!-- Present day for coupled cases at low resolution -->
+<!-- Present day for coupled cases at 1-degree or lower resolutions  -->
 <finidat hgrid="0.9x1.25"    maxpft="79"  mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
          ic_ymd="20000101" sim_year="2000" do_transient_pfts=".false."
          ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".true."
@@ -1712,7 +1712,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 >lnd/clm2/initdata_map/clmi.F2000.2000-01-01.ne120pg3_mt13_simyr2000_c200728.nc
 </finidat>
 
-<!-- Present day for coupled cases at low resolution -->
+<!-- Present day for coupled cases at 1-degree or lower resolutions  -->
 <finidat hgrid="0.9x1.25"    maxpft="79"  mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
          ic_ymd="20000101" sim_year="2000" do_transient_pfts=".false."
          ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".true."