DOC: doc error in np.absolute

[keithbriggs]

The last example uses np.abs instead of np.absolute.

https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.absolute.html

[eric-wieser]

Not really an error - np.abs is np.absolute. A comment explaining that in the docs would be nice though

[matheusportela]

This issue should be closed since #10220 already took care of it, right?

[mvinoba]

@eric-wieser I think this issue should be closed now, pinging you so you can evaluate closing it. I bumped into this issue while searching for the difficulty: Easy tag.