DOC: fix ES01 for is a dtype representation for categorical data, which

    allows users to define a fixed set of values and optionally impose an ordering.
    This is particularly useful for handling categorical variables efficiently,
    as it can significantly reduce memory usage compared to using object dtypes.

Author: tuhinsharma121

pandas/core/dtypes/dtypes.py

@@ -161,6 +161,11 @@ class CategoricalDtype(PandasExtensionDtype, ExtensionDtype):
     """
     Type for categorical data with the categories and orderedness.
 
+    It is a dtype representation for categorical data, which
+    allows users to define a fixed set of values and optionally impose an ordering.
+    This is particularly useful for handling categorical variables efficiently,
+    as it can significantly reduce memory usage compared to using object dtypes.
+
     Parameters
     ----------
     categories : sequence, optional