Merge pull request #198 from SpikeInterface/set-contacts-docs

Small docs improvement for set_contacts plane_Axes

src/probeinterface/probe.py

@@ -163,8 +163,9 @@ def set_contacts(self, positions, shapes="circle", shape_params={"radius": 10},
             Shape of each contact ('circle'/'square'/'rect').
         shape_params : dict or list of dict
             Contains kwargs for shapes ("radius" for circle, "width" for square, "width/height" for rect)
-        plane_axes : (num_contacts, 2, ndim)
-            Defines the axes of the contact plane (2d or 3d)
+        plane_axes : np.array (num_contacts, 2, ndim)
+            Defines the two axes of the contact plane for each electrode.
+            The third dimension corresponds to the probe `ndim` (2d or 3d).
         shank_ids : None or array of str
             Defines the shank ids for the contacts. If None, then
             these are assigned to a unique Shank.