Merge branch 'update-sample-bert-pretrain-args' of...

Merge branch 'update-sample-bert-pretrain-args' of https://github.com/roclark/Megatron-LM into github_small_prs

examples/pretrain_bert_distributed_with_mp.sh

@@ -23,6 +23,7 @@ python -m torch.distributed.launch $DISTRIBUTED_ARGS \
        --num-attention-heads 16 \
        --micro-batch-size 2 \
        --global-batch-size 16 \
+       --seq-length 512 \
        --max-position-embeddings 512 \
        --train-iters 1000000 \
        --save $CHECKPOINT_PATH \