Adjusting docstring details

Author: JerBouma

financetoolkit/portfolio/portfolio_controller.py

@@ -317,7 +317,7 @@ def read_portfolio_dataset(
                 - Columns can be specified in the configuration or provided explicitly.
                 - For missing cost or income columns, an exception is raised if no valid configuration is found.
 
-        Note:
+        Notes:
             - Duplicates are handled according to configuration settings ('self._cfg["general"]["adjust_duplicates"]').
             - If duplicate data is found in the combination of datasets, it will be removed to prevent double-counting.
             - The date columns are converted to datetime objects, and transaction descriptions are treated as