message: Improve depthwise convolution docstring
diff: @@ -2261,11 +2261,22 @@ class SeparableConv2D(SeparableConv):
  @keras_export('keras.layers.DepthwiseConv2D')
  class DepthwiseConv2D(Conv2D):
  - """Depthwise separable 2D convolution.
  + """Depthwise 2D convolution.
  +
  + Depthwise convolution is a type of convolution in which a single convolutional
  + filter is apply to each input channel (i.e. in a depthwise way).
  + You can understand depthwise convolution as being
  + the first step in a depthwise separable convolution.
  +
  + It is implemented via the following steps:
  +
  + - Split the input into individual channels.
  + - Convolve each input with the layer's kernel (called a depthwise kernel).
  + - Stack the convolved outputs together (along the channels axis).
  +
  + Unlike a regular 2D convolution, depthwise convolution does not mix
  + information across different input channels.
  - Depthwise Separable convolutions consist of performing
  - just the first step in a depthwise spatial convolution
  - (which acts on each input channel separately).
  The `depth_multiplier` argument controls how many
  output channels are generated per input channel in the depthwise step.
  