Updated broken link to Datasets Documentation & added --upgrade directive for Colab users.

[peremartra]

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Updated the link to the documentation of the Datasets library to the current one. The previous link was broken.

Added the --upgrade directive to the installation of the Transformers library, in the first code cell, for users running the notebook in Colab. Although Colab now includes it by default, it may be an older version, so this ensures that Colab users have the latest version of the Transformers library.

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[smith-kyle]

The diff for this pull request is better in GitNotebooks: https://gitnotebooks.com/huggingface/notebooks/pull/473

ReviewNB has a hard time when the underlying JSON diff includes spurious changes. In reality this change is quite small!