Add a link to numpy.modf

Author: antonwolfy

dpnp/dpnp_iface_mathematical.py

@@ -3357,6 +3357,8 @@ def interp(x, xp, fp, left=None, right=None, period=None):
 The fractional and integral parts are negative if the given :math:`x_i` is
 negative.
 
+For full documentation refer to :obj:`numpy.modf`.
+
 Parameters
 ----------
 x : {dpnp.ndarray, usm_ndarray}