wireframe3d add docstring documenting rstride and cstride

Author: jenshnielsen

lib/mpl_toolkits/mplot3d/axes3d.py

@@ -1717,7 +1717,9 @@ def plot_wireframe(self, X, Y, Z, *args, **kwargs):
         Plot a 3D wireframe.
 
         The `rstride` and `cstride` kwargs set the stride used to
-        sample the input data to generate the graph.
+        sample the input data to generate the graph. If either is 0
+        the input data in not sampled along this direction producing a 
+        3D line plot rather than a wireframe plot.
 
         ==========  ================================================
         Argument    Description