Update rename_columns.py

Author: raphaeljafriLB

labelpandas/rename_columns.py

@@ -25,7 +25,7 @@ def validate_column(old_col_name:str, new_col_name:str, existing_col_names:list)
         - Will also raise an error if the new column name isn't what LabelPandas is expecting
     """ 
     if old_col_name not in existing_col_names:
-        raise ValueError(f"Argument `rename_dict` requires a dictionary where:\n            \n        old_column_name : new_column_name,\n        old_column_name : new_column_name\n    \nReceived key {old_col_name} which is not an existing column name")    
+        raise ValueError(f"Argument `rename_dict` requires a dictionary where:\n            \n        `old_column_name` : `new_column_name`,\n        `old_column_name` : `new_column_name`\n    \nReceived key `{old_col_name}` which is not an existing column name")    
     if new_col_name in ["row_data", "external_id", "global_key"]:
         valid_column = True
     elif new_col_name.startswith("metadata"):
@@ -37,5 +37,5 @@ def validate_column(old_col_name:str, new_col_name:str, existing_col_names:list)
     else:
         valid_column = False
     if not valid_column:
-        raise ValueError(f"New name assignment invalid for LabelPandas - colmn name must be one of `row_data`, `external_id` or `global_key` or start with `metadata`, `attachment` or `annotation` -- received new column name {new_col_name}")
+        raise ValueError(f"New name assignment invalid for LabelPandas - colmn name must be one of `row_data`, `external_id` or `global_key` or start with `metadata`, `attachment` or `annotation` -- received new column name `{new_col_name}`")