message: Update backend.py
  Updated
diff: @@ -1221,7 +1221,7 @@ def zeros(shape, dtype=None, name=None):
  Note that if `shape` was symbolic, we cannot return a variable,
  and will return a dynamically-shaped tensor instead.
  - For Example:
  + Example:
  ```python
  from tensorflow.keras import backend as K
  @@ -1318,13 +1318,13 @@ def zeros_like(x, dtype=None, name=None):
  Arguments:
  x: Keras variable or Keras tensor.
  dtype: dtype of returned Keras variable.
  - None uses the dtype of `x`.
  + `None` uses the dtype of `x`.
  name: name for the variable to create.
  Returns:
  A Keras variable with the shape of `x` filled with zeros.
  - For Example:
  + Example:
  ```python
  from tensorflow.keras import backend as K
  