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Co-authored-by: Minjie Wang <minjie.wang@nyu.edu>

* [Doc] Generative models, edit pass

Edit for grammar and style. Can you clarify "Instead of and/or"?

* Update tutorials/models/3_generative_model/5_dgmg.py

* Update tutorials/models/3_generative_model/5_dgmg.py
Co-Authored-By: Aaron Markham <markhama@amazon.com>

* Update tutorials/models/3_generative_model/5_dgmg.py
Co-Authored-By: Aaron Markham <markhama@amazon.com>

* Update tutorials/models/3_generative_model/5_dgmg.py
Co-Authored-By: Aaron Markham <markhama@amazon.com>

* Update tutorials/models/3_generative_model/5_dgmg.py
Co-Authored-By: Aaron Markham <markhama@amazon.com>

* minor spelling tweaks

* Update CONTRIBUTORS.md

* update version; add news.md; modify contributing.md

* change urls to dmlc

* improve capsule tutorial with jinyang

* fix wrong layout of second-level tutorial

* delete transformer

* fix dgmg tutorial indentation

* bug in incidence_matrix docstring

* remove print