Fix SA01 for isna

Author: athimma2

ci/code_checks.sh

@@ -224,7 +224,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         -i "pandas.api.extensions.ExtensionArray.insert PR07,RT03,SA01" \
         -i "pandas.api.extensions.ExtensionArray.interpolate PR01,SA01" \
         -i "pandas.api.extensions.ExtensionArray.isin PR07,RT03,SA01" \
-        -i "pandas.api.extensions.ExtensionArray.isna SA01" \
         -i "pandas.api.extensions.ExtensionArray.nbytes SA01" \
         -i "pandas.api.extensions.ExtensionArray.ndim SA01" \
         -i "pandas.api.extensions.ExtensionArray.ravel RT03,SA01" \

pandas/core/arrays/base.py

@@ -767,6 +767,11 @@ def isna(self) -> np.ndarray | ExtensionArraySupportsAnyAll:
             an ndarray would be expensive, an ExtensionArray may be
             returned.
 
+        See Also
+        --------
+        ExtensionArray.dropna: Return ExtensionArray without NA values.
+        ExtensionArray.fillna: Fill NA/NaN values using the specified method.
+
         Notes
         -----
         If returning an ExtensionArray, then