Update cime_config/atm_in_paramgen.py

Co-authored-by: Jesse Nusbaumer <nusbaume@ucar.edu>

Author: jimmielin

cime_config/atm_in_paramgen.py

@@ -737,9 +737,9 @@ def _get_nml_value_str(var_name, var_type, var_val):
     >>> _get_nml_value_str("ncdata", "char*250", "'/path/to/file',")
     "'/path/to/file'"
 
-    11. Check that a character variable with quotes and trailing comma
-        outputs the correct value:
-    >>> _get_nml_value_str("ncdata", "char*250", " '/path/to/file', ")
+    11. Check that a character variable with quotes and a trailing comma
+        surrounded by white space outputs the correct value:
+    >>> _get_nml_value_str("ncdata", "char*250", " '/path/to/file' , ")
     "'/path/to/file'"
     """