message: Update the doc to reflect the change of replacing std::clock with random::New64() as random number generator seed.
diff: @@ -116,7 +116,7 @@ a different `feature_bagging_fraction * num_features` sized subset of the
  input features. Defaults to 1.0 (no feature bagging).
  * `base_random_seed`. By default (`base_random_seed = 0`), the random number
  -generator for each tree is seeded by the current time (in microseconds) when
  +generator for each tree is seeded by a 64-bit random value when
  each tree is first created. Using a non-zero value causes tree training to
  be deterministic, in that the i-th tree's random number generator is seeded
  with the value `base_random_seed + i`.
  