Add a note why mkl_vm::remainder() is not intended to be used

Author: antonwolfy

dpnp/dpnp_iface_mathematical.py

@@ -3969,6 +3969,8 @@ def real_if_close(a, tol=100):
     ti._remainder,
     _REMAINDER_DOCSTRING,
     binary_inplace_fn=ti._remainder_inplace,
+    # mkl_vm::remainder() isn't implemented, because it follows C's modulo
+    # operator, but Python's one is expected acc to Python Array API spec
 )
 
 mod = remainder