message: Update doc for he_normal and lecun_normal according to issue 25564
diff: @@ -1322,8 +1322,9 @@ def lecun_normal(seed=None):
  """LeCun normal initializer.
  It draws samples from a truncated normal distribution centered on 0
  - with `stddev = sqrt(1 / fan_in)`
  - where `fan_in` is the number of input units in the weight tensor.
  + with standard deviation (after truncation) given by
  + `stddev = sqrt(1 / fan_in)` where `fan_in` is the number of
  + input units in the weight tensor.
  Arguments:
  seed: A Python integer. Used to seed the random generator.
  @@ -1372,8 +1373,9 @@ def he_normal(seed=None):
  """He normal initializer.
  It draws samples from a truncated normal distribution centered on 0
  - with `stddev = sqrt(2 / fan_in)`
  - where `fan_in` is the number of input units in the weight tensor.
  + with standard deviation (after truncation) given by
  + `stddev = sqrt(2 / fan_in)` where `fan_in` is the number of
  + input units in the weight tensor.
  Arguments:
  seed: A Python integer. Used to seed the random generator.
  