Update geothermal O&M eqn documentation

ssc/cmod_geothermal_costs_eqns.h

@@ -41,23 +41,23 @@ extern "C" {
 #endif
 
 static const char* getem_om_cost_calc_doc =    
-    "Add documentation here \\n\\n"
+    "Calculate annual O&M costs for geothermal power plants \\n\\n"
     "Input: var_table with key-value pairs\\n"
-    "     'gross_output': double [units]\\n"
-    "     'conversion_type': double [units]\\n"
+    "     'gross_output': double [MW]\\n"
+    "     'conversion_type': double [-]\\n"
     "     'baseline_cost': double [$] \\n"
-    "     'ppi_base_year': double [year] \\n"
-    "     'cwflow': double [units] \\n"
+    "     'ppi_base_year': double [-] \\n"
+    "     'cwflow': double [kg/s] \\n"
     "     'drilling_cost': double [$] \\n"
-    "     'field_gathering_system_cost': double [units] \\n"
-    "     'GF_flowrate': double [units] \\n"
-    "     'num_wells': double [units] \\n"
-    "     'water_loss': double [units] \\n"
+    "     'field_gathering_system_cost': double [$] \\n"
+    "     'GF_flowrate': double [kg/s] \\n"
+    "     'num_wells': double [-] \\n"
+    "     'water_loss': double [%] \\n"
     "     'total_installed_cost': double [$] \\n"
-    "     'pump_cost_install': double [units] \\n"
-    "     'pump_only_cost': double [units] \\n"
-    "     'pump_type': double [units] \\n"
-    "     'pump_depth': double \\n"
+    "     'pump_cost_install': double [$] \\n"
+    "     'pump_only_cost': double [$] \\n"
+    "     'pump_type': double [-] \\n"
+    "     'pump_depth': double [m] \\n"
     "Output: key-value pairs added to var_table\\n"
     "     'total_getem_om_cost': double [$]";