[PY] Add documentation to the cocycles output

Signed-off-by: julian <julian.burellaperez@heig-vd.ch>

gph/python/ripser_interface.py

@@ -481,6 +481,15 @@ def ripser_parallel(X, maxdim=1, thresh=np.inf, coeff=2, metric="euclidean",
                 Essential simplices corresponding to infinite bars in
                 dimensions 1 to maxdim, with 2 vertices (edge) for each birth.
 
+        'cocycles': list (size maxdim) of list of ndarray, optional
+            For each dimension less than 'maxdim' a list of representative
+            cocycles. Each representative cocycle in dimension 'd' is
+            represented as a ndarray of '(k,d+1)' elements. Each non zero value
+            of the cocycle is laid out in a row, first the 'd' indices of the
+            simplex and then the value of the cocycle on the simplex. The
+            indices of the simplex reference the original point cloud.
+            'cocycles' are only available if 'return_cocycles' is True.
+
     Notes
     -----
     The C++ backend and Python API for the computation of Vietoris–Rips