DOC: Group relevant df.mask/df.where examples together (#37032)

- Close #25187

Author: hongshaoyang

pandas/core/generic.py

@@ -9095,7 +9095,6 @@ def where(
         3    3.0
         4    4.0
         dtype: float64
-
         >>> s.mask(s > 0)
         0    0.0
         1    NaN
@@ -9111,6 +9110,13 @@ def where(
         3    3
         4    4
         dtype: int64
+        >>> s.mask(s > 1, 10)
+        0     0
+        1     1
+        2    10
+        3    10
+        4    10
+        dtype: int64
 
         >>> df = pd.DataFrame(np.arange(10).reshape(-1, 2), columns=['A', 'B'])
         >>> df