Review Integrate_NLP_Libraries.ipynb and update as needed

[frreiss]

This issue covers making another review pass over the notebook notebooks/Integrate_NLP_Libraries.ipynb to cover the following:

• Identify areas where the Markdown text and code isn't clear to a newcomer to the project
• Make sure the notebook works in hosted Jupyter environments (Watson Studio, Colab, and similar)

You can create pull requests to address any issues with clarity of the code and text and/or making the notebook work in hosted Jupyter. Be sure to reference this issue in your PRs.