CLN: Remove trailing whitespace in docstring and adding comment

Author: anishkarki

pandas/core/generic.py

@@ -7802,16 +7802,16 @@ def interpolate(
         2  2.0  3.0 -3.0   9.0
         3  2.0  4.0 -4.0  16.0
 
-        Using polynomial interpolation.
+        # Using polynomial interpolation.
 
         >>> df["d"].interpolate(method="polynomial", order=2)
         0     1.0
         1     4.0
         2     9.0
         3    16.0
         Name: d, dtype: float64
-        Using index method for linear interpolation
-        with non-sequential index.
+        # Using index method for linear interpolation with
+        # non-sequential index.
         >>> data_non_seq = {"val": [1, np.nan, 3]}
         >>> df_non_seq = pd.DataFrame(
         ...     data, index=[0, 1, 6]