DOC: fix docstring validation errors for pandas.core.window (#59634)

* DOCS: pandas.core.window SA01 docstring validation error fixed

* DOC: pandas.core.window SA01 docstring validation error linting fixes

* DOC: pandas.core.window.rolling.Window.var PR01 docstring validation fix

Author: hlakams

ci/code_checks.sh

@@ -229,11 +229,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.core.resample.Resampler.sum SA01" \
         -i "pandas.core.resample.Resampler.transform PR01,RT03,SA01" \
         -i "pandas.core.resample.Resampler.var SA01" \
-        -i "pandas.core.window.expanding.Expanding.corr PR01" \
-        -i "pandas.core.window.expanding.Expanding.count PR01" \
-        -i "pandas.core.window.rolling.Rolling.max PR01" \
-        -i "pandas.core.window.rolling.Window.std PR01" \
-        -i "pandas.core.window.rolling.Window.var PR01" \
         -i "pandas.date_range RT03" \
         -i "pandas.errors.AbstractMethodError PR01,SA01" \
         -i "pandas.errors.AttributeConflictWarning SA01" \

pandas/core/window/expanding.py

@@ -174,6 +174,8 @@ def aggregate(self, func, *args, **kwargs):
 
     @doc(
         template_header,
+        create_section_header("Parameters"),
+        kwargs_numeric_only,
         create_section_header("Returns"),
         template_returns,
         create_section_header("See Also"),
@@ -865,6 +867,9 @@ def cov(
             output will be a MultiIndexed DataFrame in the case of DataFrame
             inputs. In the case of missing elements, only complete pairwise
             observations will be used.
+        ddof : int, default 1
+            Delta Degrees of Freedom.  The divisor used in calculations
+            is ``N - ddof``, where ``N`` represents the number of elements.\n
         """
         ).replace("\n", "", 1),
         kwargs_numeric_only,

pandas/core/window/rolling.py

@@ -1350,6 +1350,13 @@ def mean(self, numeric_only: bool = False, **kwargs):
     @doc(
         template_header,
         create_section_header("Parameters"),
+        dedent(
+            """
+        ddof : int, default 1
+            Delta Degrees of Freedom.  The divisor used in calculations
+            is ``N - ddof``, where ``N`` represents the number of elements.
+        """
+        ).replace("\n", "", 1),
         kwargs_numeric_only,
         kwargs_scipy,
         create_section_header("Returns"),
@@ -1392,6 +1399,13 @@ def var(self, ddof: int = 1, numeric_only: bool = False, **kwargs):
     @doc(
         template_header,
         create_section_header("Parameters"),
+        dedent(
+            """
+        ddof : int, default 1
+            Delta Degrees of Freedom.  The divisor used in calculations
+            is ``N - ddof``, where ``N`` represents the number of elements.
+        """
+        ).replace("\n", "", 1),
         kwargs_numeric_only,
         kwargs_scipy,
         create_section_header("Returns"),
@@ -2099,7 +2113,19 @@ def sum(
         template_header,
         create_section_header("Parameters"),
         kwargs_numeric_only,
+        dedent(
+            """
+            *args : iterable, optional
+                Positional arguments passed into ``func``.\n
+            """
+        ).replace("\n", "", 1),
         window_agg_numba_parameters(),
+        dedent(
+            """
+            **kwargs : mapping, optional
+                A dictionary of keyword arguments passed into ``func``.\n
+            """
+        ).replace("\n", "", 1),
         create_section_header("Returns"),
         template_returns,
         create_section_header("See Also"),