Add units to description of new namelist options

Author: kuanchihwang

bld/namelist_files/namelist_definition.xml

@@ -8993,13 +8993,13 @@ Default: 0.5
 
 <entry id="mpas_epssm_transition_bottom_z" type="real" category="mpas"
        group="damping" valid_values="positive real values">
-Height above MSL for the bottom of transition zone for epssm.
+Height (in meters) above MSL for the bottom of transition zone for epssm.
 Default: 30000.0
 </entry>
 
 <entry id="mpas_epssm_transition_top_z" type="real" category="mpas"
        group="damping" valid_values="positive real values">
-Height above MSL for the top of transition zone for epssm.
+Height (in meters) above MSL for the top of transition zone for epssm.
 Default: 50000.0
 </entry>