Update index.rst

Author: dave-doty

doc/index.rst

@@ -25,15 +25,15 @@ Interoperability - cadnano v2
 
 Scadnano provides function to convert design to and from cadnano v2:
 
-* :py:meth:`scadnano.DNADesign.from_cadnano_v2` will create a scadnano DNADesign from a ``cadnanov2`` json file.
-* :py:meth:`scadnano.DNADesign.export_cadnano_v2` will produce a ``cadnanov2`` json file from a scadnano design.
+* :meth:`scadnano.DNADesign.from_cadnano_v2` will create a scadnano DNADesign from a ``cadnanov2`` json file.
+* :meth:`scadnano.DNADesign.export_cadnano_v2` will produce a ``cadnanov2`` json file from a scadnano design.
 
 **Important**
 
 All ``cadnanov2`` designs can be imported to scadnano. However **not all scadnano designs can be imported 
 to cadnanov2**, to be exportable to ``cadnanov2`` a scadnano design need to comply with the following points:
 
-* The design cannot feature any :py:class:`Loopout` as it is not a concept that exists in ``cadnanov2``.
+* The design cannot feature any :class:`Loopout` or :class:`Extension`, since these are not concepts that exist in ``cadnanov2``.
 * Following ``cadnanov2`` conventions, helices with **even** number must have their scaffold going **forward** and helices with **odd** number **backward**.
 * If you use paranemic crossovers (i.e. crossovers where the domains before and after the crossover are in the same direction), the helices' row number (i.e. not the helices' indexes but their y coordinate) of the domains must have the same parity e.g. rows 0 and 2, or 1 and 3, but not 0 and 1.