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This commit changes a tiny typo in the Eager Execution notebook.

* "Machine Learning" --> Machine learning.
* "steepest the ascent" --> "steepest ascent"
* "standard gradient descent" --> "stochastic gradient descent"

Seems like it was changed accidentally as it is different than any of the other files.

set `/examples` as the working directory

There is no `data` directory, these instructions work without this line.

Added correct link to blogpost
Changed Sentosa to Setosa in a couple of places