Add explanation : pip install tensorflow-addons

[lazybuttrying]

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I have seen colab link on documents. After I executed the code, colab needs installation of tensorflow-addons. For consistency, I copied install message in another example file. It's not serious, but I think if it added, it will be better. Thanks.

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[pcoet]

Hi @lazybuttrying, thanks for the PR. Are you still working on this? Please let us know. Otherwise we'll close the request. Thanks!

[github-actions[bot]]

This PR is stale because it has been open for 14 days with no activity. It will be closed if no further activity occurs. Thank you.

[github-actions[bot]]

This PR was closed because it has been inactive for 28 days. Please reopen if you'd like to work on this further.