Modified example in DepthwiseConv2D file (#20292)

* Modified example in depthwise_conv2d file

modified example code

* Update depthwise_conv2d.py

---------

Co-authored-by: François Chollet <francois.chollet@gmail.com>

Author: keerthanakadiri

keras/src/layers/convolutional/depthwise_conv2d.py

@@ -93,9 +93,9 @@ class DepthwiseConv2D(BaseDepthwiseConv):
     Example:
 
     >>> x = np.random.rand(4, 10, 10, 12)
-    >>> y = keras.layers.DepthwiseConv2D(3, 3, activation='relu')(x)
+    >>> y = keras.layers.DepthwiseConv2D(kernel_size=3, activation='relu')(x)
     >>> print(y.shape)
-    (4, 8, 8, 36)
+    (4, 8, 8, 12)
     """
 
     def __init__(