message: Update README.md, fix some typo
diff: # DCN CTR SAMPLE #
  -A sample of who to build and train Deep & Cross Network with HugeCTR [(link)](https://arxiv.org/pdf/1708.05123.pdf).
  +A sample of building and training Deep & Cross Network with HugeCTR [(link)](https://arxiv.org/pdf/1708.05123.pdf).
  ## Dataset and preprocess ##
  The data is provided by CriteoLabs (http://labs.criteo.com/2014/02/kaggle-display-advertising-challenge-dataset/). The original training set contains 45,840,617 examples. Each example contains a label (1 if the ad was clicked, otherwise 0) and 39 features (13 integer features and 26 categorical features). The original test set doesn't contain labels, so it's not used.
  