DOC: linalg: don't recommend np.linalg.norm

[larsmans]

The scipy.linalg.norm docstring is quite confusing because it seems to recommend np.linalg.norm instead, even though that function can be several times slower. It also has an axis keyword that scipy.linalg.norm doesn't have, adding to the confusion.

[coveralls]

Coverage remained the same when pulling ef66145 on larsmans:scipy-not-numpy-norm into 57ac922 on scipy:master.

[rgommers]

Agreed, this is clearer. Thanks @larsmans

[WarrenWeckesser]

FYI: In numpy 1.8, numpy.linalg.norm has an axis argument.

[ewmoore]

Warren Weckesser wrote:

FYI: In numpy 1.8, |numpy.linalg.norm| has an |axis| argument.

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#2987 (comment).

Truthfully, there is no reason that scipy and numpy should be different
here. Can we open an issue (say labeled as a Task) on the numpy tracker
(or here if necessary) to normalize these two? I understand that it may
require wrapping (s,d,sc,dz)nrm2 and adding it to blas_lite.

[larsmans]

I have a PR over at NumPy that uses dot in norm.