make minor modifications to licnese wording

LICENSE

@@ -28,7 +28,7 @@ The following applies to all files unless otherwise noted:
 
 --
 
-This repository also contains code from huggingface, Google Research,
+This repository also contains code from Hugging Face Inc., Google Research,
 and Facebook (from their Fairseq project). Files from these
 organizations have notices at the top of each file. Below are licenses
 used in those files, as indicated.

megatron/data/dataset_utils.py

@@ -14,6 +14,10 @@
 # limitations under the License.
 
 
+# Most of the code here has been copied from:
+#   https://github.com/google-research/albert/blob/master/create_pretraining_data.py
+# with some modifications.
+
 import collections
 import numpy as np
 

megatron/tokenizer/bert_tokenization.py

@@ -12,6 +12,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 """Tokenization classes."""
 
 from __future__ import absolute_import