Fix bad images and other minor text changes

[anirudh161]

• Motivation for features / changes

Fixed missing TensorBoard iframes by saving notebook with outputs. Made some minor text changes

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[stephanwlee]

@anirudh161 did you mean to add the output cell contents? The change is larger than expected and was wondering if that was intended.

[anirudh161]

Yes, that was intentional. I sent out this PR as a workaround for the issue where TensorBoard does not get rendered on tensorflow.org and instead outputs broken iframes. Saving outputs in the notebook prevents DevSite from separately running the code cells in the notebooks and causing broken iframes

[wchargin]

@anirudh161: If preserving outputs is intentional, could you please
ensure that this notebook sets private_outputs: false so that
nbfmt.py knows not to erase them? (cc @lamberta)

[anirudh161]

Submitted a new PR (#3468 ) with these and a couple of additional changes. Closing this one