Identical docstrings in two functions

The following two methods have identical docstrings (at least on the doc pages)

http://networkx.github.io/documentation/latest/reference/generated/networkx.algorithms.assortativity.k_nearest_neighbors.html#networkx.algorithms.assortativity.k_nearest_neighbors

http://networkx.github.io/documentation/latest/reference/generated/networkx.algorithms.assortativity.average_degree_connectivity.html#networkx.algorithms.assortativity.average_degree_connectivity