Invalid usage suggested in legend docstring

[stefanv]

The legend docstring gives as an example:

legend( (line1, line2, line3),  ('label1', 'label2', 'label3'), loc=2)

which results in:

legend.py:610: UserWarning: Legend does not support [<matplotlib.lines.Line2D object at 0x2bf2d10>]
Use proxy artist instead.

http://matplotlib.sourceforge.net/users/legend_guide.html#using-proxy-artist

[stefanv]

Ah, very confusing, but forgot to unpack the line, hence passed a tuple of tuples as lines, which looks fine from the error message, but is actually incorrect.