Expanded docstring of dpctl.tensor.from_dlpack

Author: oleksandr-pavlyk

dpctl/tensor/_dlpack.pyx

@@ -361,8 +361,16 @@ cpdef usm_ndarray from_dlpack_capsule(object py_caps) except +:
 
 
 cpdef from_dlpack(array):
-    """Constructs `usm_ndarray` from a Python object that implements
-    `__dlpack__` protocol.
+    """dpctl.tensor.from_dlpack(obj)
+
+    Constructs :class:`dpctl.tensor.usm_ndarray` instance from a Python
+    object `obj` that implements `__dlpack__` protocol. The output
+    array is always a zero-copy view of the input.
+
+    Raises:
+        TypeError: if `obj` does not implement `__dlpack__` method.
+        ValueError: if zero copy view can not be constructed because
+            the input array resides on an unsupported device.
     """
     if not hasattr(array, "__dlpack__"):
         raise TypeError(