Simplify operations in word2vec tutorial

[metric-space]

Replace operations in word2vec tutorial with simpler operations. Remove the unnecessary usage of tf.squeeze in many places

[google-cla[bot]]

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[github-actions[bot]]

Preview

Preview and run these notebook edits with Google Colab:

• site/en/tutorials/text/word2vec.ipynb

Rendered notebook diffs available on ReviewNB.com.

Format and style

Use the TensorFlow docs notebook tools to format for consistent source diffs and lint for style:

$ python3 -m pip install -U --user git+https://github.com/tensorflow/docs

$ python3 -m tensorflow_docs.tools.nbfmt notebook.ipynb

$ python3 -m tensorflow_docs.tools.nblint --arg=repo:tensorflow/docs notebook.ipynb

If commits are added to the pull request, synchronize your local branch: git pull origin word2vec-redundant-ops

[metric-space]

Finished signing the cla just now, not sure how to restart the process

[8bitmp3]

PTAL @MarkDaoust @markmcd

[markmcd]

LGTM