DOC: add PR01,SA01 for pandas.api.indexers.FixedForwardWindowIndexer

pandas/core/indexers/objects.py

@@ -313,7 +313,27 @@ def get_window_bounds(
 
 class FixedForwardWindowIndexer(BaseIndexer):
     """
-    Create window boundaries for fixed-length windows that include the current row.
+    Creates window boundaries for fixed-length windows that include the current row.
+
+    Parameters
+    ----------
+    index_array : np.ndarray, default None
+        Array-like structure representing the indices for the data points.
+        If None, the default indices are assumed. This can be useful for
+        handling non-uniform indices in data, such as in time series
+        with irregular timestamps.
+    window_size : int, default 0
+        Size of the moving window. This is the number of observations used
+        for calculating the statistic. The default is to consider all
+        observations within the window.
+    **kwargs
+        Additional keyword arguments passed to the subclass's methods.
+
+    See Also
+    --------
+    DataFrame.rolling : Provides rolling window calculations.
+    api.indexers.VariableWindowIndexer : Calculate window bounds based on
+        variable-sized windows.
 
     Examples
     --------