refactor: update docstrings and remove redundant comments

In this commit, we have updated the docstring for the `_get_data_df` method
in the `DataDescription` class to provide more detailed information about its functionality.
We have also removed the redundant comments from the `__init__` method of the `col` class in `utils.py`
as they were not providing any additional value.

janitor/accessors/data_description.py

@@ -13,11 +13,14 @@ class DataDescription:
     """
 
     def __init__(self, data):
-        """Initialize DataDescription class."""
         self._data = data
         self._desc = {}
 
     def _get_data_df(self) -> pd.DataFrame:
+        """Get a table of descriptive information in a DataFrame format.
+
+        :returns: A DataFrame containing the descriptive information.
+        """
         df = self._data
 
         data_dict = {}

janitor/functions/utils.py

@@ -1057,14 +1057,6 @@ class col:
     """
 
     def __init__(self, column: Hashable):
-        """Initialize a new instance of the `col` class.
-
-        Args:
-            column (Hashable): The name of the column to be selected.
-
-        Raises:
-            TypeError: If the `column` parameter is not hashable.
-        """
         self.cols = column
         check("column", self.cols, [Hashable])
         self.join_args = None